Terms of Use

1Scope and Availability

These Terms govern the rights and obligations between the operator and the contracting guardian in relation to use of the service.

This English text is provided for reference only. The Japanese version is the authoritative text, and the Japanese version prevails in the event of any discrepancy.

The subscription screens, pricing pages, the Subscription and Refund Policy, and any other individual terms presented within the service form part of these Terms. Where they differ from these Terms, those individual terms prevail unless they provide otherwise.

The service is offered only to residents of Japan. Residents outside Japan cannot subscribe to a paid plan unless and until the operator announces availability in their region.

2Contracting Party and the Registered Child

The contracting party is one adult who is the parent with parental authority, the guardian of a minor, or otherwise the statutory legal representative of the registered child under Japanese law.

The contracting guardian registers an email address under their own control and subscribes after reviewing these Terms, the fees, the auto-renewal conditions, and the handling of the child’s information.

One account may register one child. The child may use the service but is not a party to the contract, and cannot independently make payments, change plans, cancel, change registration details, or delete the account. The child uses the contracting guardian’s account; there is no separate login for the child.

A guardian other than the contracting guardian may view the child’s learning status through screens managed by the contracting guardian, provided that credentials are not shared. That guardian does not thereby become a party to the contract or an account administrator.

The contracting guardian shall explain to the child, in a manner suited to the child’s level of understanding, how to use the service and how information is handled, and shall appropriately supervise the child’s use.

3Account Responsibilities

The contracting guardian must provide registration information that is true, accurate, and current.

The contracting guardian must manage credentials at their own responsibility and must not share them with third parties, including guardians other than the contracting guardian. The service must not be made available to friends, members of other households, or any other third party who is not a legitimate guardian of the registered child.

If the contracting guardian becomes aware of any leak, unauthorized use, or risk of either, they must promptly notify the operator.

Changes to the registered email address, contract information, or other material registration details are, in principle, made by the contracting guardian using the registered email address. Where that address cannot be used, the operator may accept a change only if it can reasonably confirm the person’s identity using the minimum necessary contract information, and may refuse where confirmation is not possible or impersonation is suspected.

4Content of the Service

The service provides arithmetic learning for children, records of learning history, displays responsive to learning status, and review features for guardians.

The service does not substitute for school education, individual tutoring, medical care, psychological counseling, or assessment by professionals. The operator does not guarantee any particular outcome, including grades, academic ability, concentration, or psychological state.

Available problems, features, supported devices, and other conditions of provision are announced within the service.

The operator may grant, to individually designated recipients, a complimentary right to use the service for a defined period. Such a right is not a free plan or free trial available for general subscription, and does not involve an application, payment of fees, or formation of a contract.

These Terms apply to a person using the service under that right (a "Complimentary User"), except for the provisions on fees, auto-renewal, plan changes, failed payments, cancellation, and refunds. References to the "contracting guardian" are read as references to the Complimentary User.

The period of complimentary use and the conditions for its start and end are as presented by the operator at the time of the grant. The operator has no obligation to extend or re-grant it. A Complimentary User may subscribe to a paid plan at their option.

The cap on liability set out under "Warranty and Liability" does not apply to a Complimentary User. The other provisions of that section continue to apply.

5Subscription and Formation of the Contract

Before confirming a subscription, the contracting guardian shall review the tax-inclusive fee for each plan, the fact that the contract auto-renews with no fixed end date and the length of one contract period, the billing cycle and when the next billing date is determined and how to check it, when provision begins, how and by when to cancel and the effects of cancellation, and the principal refund conditions.

The contract is formed at the point the payment for the subscription succeeds. The operator records the content of the concluded contract. That record serves to evidence formation; neither its existence nor its timing affects formation of the contract.

The operator may decline a subscription where payment did not succeed, the application contains deficiencies, there is a risk of fraudulent use, or there is another reasonable ground.

Emails regarding receipt or acceptance are notices for confirming the contract details. Delivery of an email alone is not a condition for formation of the contract.

6Plans, Fees, and Payment

Fees for Japan are JPY 1,200 per month or JPY 8,000 per year, both tax included. There is no free trial or free learning plan available for general subscription (excluding the individual grants described above).

Fees are paid through the payment functions provided by Stripe, using the method shown on the subscription screen. The operator does not itself store the contracting guardian’s full card number; Stripe’s terms apply to the handling of payment information.

Where the contracting guardian continues on the same plan, the operator will in principle maintain the fee applicable at the start of the contract, except where there is a change in tax rates, a change in law, a change in the payment provider’s specifications, or another unavoidable circumstance. In such a case the operator gives advance notice.

7Auto-Renewal

The monthly and annual plans auto-renew every one month or one year respectively, unless the contracting guardian completes the cancellation procedure.

At each renewal, the fee applicable at subscription or as lawfully changed for that renewal is charged to the registered payment method.

The next scheduled billing date and the contract status can be checked on the guardian’s management screen or in Stripe’s Customer Portal. The auto-renewal conditions are displayed together with the fees and other material conditions before the subscription is confirmed.

8Plan Changes

A change from the monthly plan to the annual plan is made through Stripe’s Customer Portal from the guardian’s management screen. Changes from the annual plan to the monthly plan are not currently accepted.

On such a change, Stripe’s calculation may produce a credit for the unused period, a charge for the difference, or a change to the billing date. The contracting guardian shall review the resulting plan, effective date, amount charged, credit, and next billing date displayed before confirming.

The operator does not add and charge any proration of its own that was not displayed before the subscription was confirmed.

9Failed Payments

Where a payment fails, we do not suspend access immediately, and may allow a grace period corresponding to the payment provider’s retries and other collection procedures. During the grace period, the contracting guardian may update the payment method and pay the outstanding amount.

The length of the grace period, the timing of retries, and notices may differ depending on the billing cycle, the payment status, and Stripe’s settings. If payment is not completed by the end of the grace period, we may stop further access to learning.

Once payment is confirmed, the operator restores access within a reasonable period. The specific scope of use available during a failed payment and the scheduled suspension date are communicated on the guardian’s screen or by email.

10Cancellation

The contracting guardian may stop the next renewal at any time through Stripe’s Customer Portal. Cancellation is accepted at the point the procedure is completed in the Portal, and takes effect on the last day of the current paid contract period.

The contracting guardian may continue to use the service until the last day of that period. After cancellation takes effect, no new learning can be started, although the minimum synchronization necessary to preserve learning records already stored on the device may still take place.

Deleting the app, logging out, clearing browser data, or simply not using the service does not cancel the subscription.

Where the Customer Portal cannot be used (you cannot log in, there is a failure on the payment provider’s side, or the cancellation procedure is not displayed), you may request cancellation by contacting the support desk before the next renewal date. The operator will confirm your identity and carry out the cancellation within a reasonable period.

Where such a request arrives before the next renewal date but the operator’s handling extends past that date, the operator refunds the fee for that renewal.

11Refunds

For a cancellation partway through a contract period for the contracting guardian’s own convenience, the operator does not provide a prorated refund of fees already paid, except where otherwise provided by law. The service remains available until the last day of the contract period.

Where duplicate billing is confirmed, where the service could not be used due to a clear system failure or a deficiency on the operator’s part, where the contracted service was not provided due to causes attributable to the operator, where the operator terminates the service partway through a paid period for its own reasons, or where a refund is otherwise appropriate in light of the individual circumstances, the operator verifies the facts and provides a full or partial refund or other appropriate response.

The above does not limit any right of rescission, termination, damages, or other right that the contracting guardian has under law.

To request a refund, contact the support desk from the registered email address with the billing concerned, the reason, and the information needed for verification.

12Account Deletion

Cancelling a subscription and deleting an account are different procedures. Cancellation alone does not immediately delete the account or the learning history. The contracting guardian may request deletion of the account and of learning data linked to individuals, by the method the operator indicates.

Where account deletion is requested during a paid contract period, the operator immediately cancels that subscription and then carries out the deletion. We do not refund the fee for the remaining period. To use the service until the last day of the contract period, cancel first and request deletion after the period ends.

Where, after a deletion request, a payment is completed through payment processing that was already in progress before the request, that payment is not subject to the treatment above: the operator cancels the subscription and refunds that payment in full.

After account deletion, the account and the deleted data cannot be restored through the ordinary procedures available to the contracting guardian. The handling of information retained as required by law or for legitimate operational reasons, and of information remaining during ordinary backup rotation, is set out in the Privacy Policy.

The operator may retain information necessary for billing, payment and refunds, contracts and consents, tax and accounting, security, fraudulent use, inquiries, or dispute handling, limited to the scope and period necessary. Such records may be retained after severing their correspondence with names, email addresses, and other directly identifying information; identifiers assigned by the payment provider and internal management IDs are retained within them in order to stop billing and identify the contract.

Information stored only on the device and technically inaccessible to the operator must be deleted by the contracting guardian on that device or browser. For the device from which the request is made, the operator erases such information to the extent technically possible. Because logging in again is not possible once deletion is complete, information remaining on other devices should be removed by clearing this site’s site data and cookies from that device’s browser settings.

The scope of information deleted, the information retained after deletion, and the details of its handling are set out in the Privacy Policy.

13Prohibited Conduct

The contracting guardian and the child using the service must not engage in the following conduct.

• Conduct that violates law or public order and morals
• Conduct that infringes the intellectual property rights, privacy, reputation, or other rights of the operator or a third party
• Unauthorized access, exploitation of vulnerabilities, attacks, imposing excessive load, or other conduct that interferes with the safe operation of the service
• Analyzing, circumventing, or altering the mechanisms of the service for improper purposes
• Sharing credentials, allowing a third party to use the account, or impersonating another person
• Collecting information beyond the ordinary scope of use, or operating the service, by automated means
• Fraudulent payment, abuse of the refund system, or other conduct that unfairly harms the operator or a third party
• Facilitating or attempting any of the foregoing

14Intellectual Property

Rights in the programs, text, problems, images, audio, designs, trademarks, and other content that make up the service belong to the operator or the rightful rights holders.

The contracting guardian and the child may use the service for household learning purposes, and must not reproduce, republish, sell, redistribute, transmit to the public, or otherwise use it beyond the scope of private use without prior permission.

The operator does not acquire a blanket assignment of copyright or other rights in answers, comments, or other information entered by the child. The operator handles such information to the extent necessary to provide, maintain, and secure the service and to make the improvements described in the Privacy Policy.

15Restriction or Suspension of Use

For minor breaches or issues that can be remedied, the operator will in principle notify the contracting guardian and request correction within a reasonable period.

Where there is unauthorized access, an attack, or a serious security risk; a high risk of fraudulent use of payment information or fraud; a serious breach requiring urgent action to protect rights or safety; or a requirement under law or from a public authority, the operator may temporarily restrict or suspend all or part of use without prior notice.

The operator explains the reason, effect, and duration of any restriction or suspension, to the extent this does not impede legal, security, or investigative requirements.

Where use is suspended for breach of these Terms, the operator will in principle not provide a refund, taking into account the nature of the breach, the period of suspension, the unprovided portion, other circumstances, and applicable law.

16Maintenance and Emergency Response

The operator may temporarily suspend all or part of the service for maintenance, updates, or equipment inspection, and announces scheduled suspensions in advance where possible.

Where there is a failure, security incident, disaster, communications failure, or other urgent circumstance, the operator may take necessary action without prior announcement, and endeavours to keep the impact as small as reasonably possible.

17Change or Termination of the Service

The operator may change the content of the service, taking into account the impact on users, the necessity, and the reasonableness of the change. Material changes in relation to the purpose of use or the fees are notified in advance by email or within the service.

Where the operator terminates the service, it will in principle notify the contracting guardian approximately three months in advance, except where unavoidable.

Where the operator terminates the service partway through a paid contract period for its own reasons and does not provide the service for the remaining period, it calculates the fee for that unprovided period on a prorated basis by a reasonable method and refunds it, unless it provides an alternative service or other measure that does not disadvantage the contracting guardian.

The period of availability on termination, the method of obtaining or deleting data, and other matters follow the announcement made at the time of termination and applicable law.

18Changes to These Terms and to Fees

The operator may change these Terms in accordance with the Civil Code and other laws where the change conforms to the general interest of contracting guardians, or where it does not contradict the purpose of the contract and is reasonable in light of the necessity and the reasonableness of the changed content.

The operator publishes the content of the change and its effective date within the service before it takes effect.

For changes that materially affect the contracting guardian — including fees, auto-renewal, principal available features, cancellation and refunds, liability, and the handling of children’s information — the operator allows a reasonable notice period and gives individual notice, including by sending it to the registered email address.

The operator does not implement, by notice alone, any change that requires individual consent under law.

19Notices and Inquiries

Important notices are given by sending them to the registered email address, by display within the service, or by another reasonable method. The contracting guardian should keep the registered email address able to receive messages.

Inquiries are accepted at the email desk displayed within the service; email is the primary means of inquiry. The operator sends an automatic acknowledgement on receipt and endeavours to provide a first human response in principle within three business days, although this may take longer depending on the matter, holidays, disasters, or other circumstances.

As a supplementary means, the operator displays a telephone number. Telephone inquiries are received by recording; the operator does not staff the line for direct conversation, and returns calls where it determines this to be necessary.

Notwithstanding the above, where a cancellation request or another time-limited request reaches the operator by recording, it is treated as received at the point it arrives. Whether a call is returned does not affect the validity of the request.

20Warranty and Liability

The operator does not warrant that the service will operate without interruption on all devices at all times, that all errors will be corrected, or that any particular learning outcome will be achieved.

Where the contracting guardian suffers loss due to causes attributable to the operator, the operator compensates that loss in accordance with law.

For loss arising from the operator’s slight negligence, liability is limited to ordinary and direct loss, and is capped at the total fees actually paid for the service in the 12 months before the loss arose.

The preceding paragraph does not apply to loss caused by intent or gross negligence, loss of life or bodily injury, loss arising from improper handling of personal information, or any other case where limitation of liability is not permitted under law.

Where any part of this section is void under the Consumer Contract Act or another mandatory law, that law prevails to that extent.

21Assignment and Severability

The contracting guardian must not assign, transfer, or pledge their status or rights and obligations under these Terms without the operator’s prior consent.

Where the operator transfers the business relating to the service to a third party, it gives the necessary notice in accordance with law.

If any part of these Terms is held void or unenforceable, the remaining parts remain in effect.

22Governing Law and Dispute Resolution

Japanese law applies to these Terms and to contracts relating to the service.

Where a dispute arises, the contracting guardian and the operator first seek resolution through good-faith discussion. Where discussion does not resolve the matter, the court having jurisdiction under Japanese law is the court of first instance.

23Japanese Version

The Japanese version of these Terms is the authoritative text. Where a translation is provided, the operator endeavours to keep the content consistent, but to the extent permitted by law the Japanese version prevails in the event of any discrepancy.