Terms of Service

Last Updated: August 13, 2025 Rumahsaku Corp.

Article 1 (Application)

These Terms of Service (the "Terms") define the conditions for using the TangoWrist application (the "App") provided by Rumahsaku Corp. (the "Company"). Users (the "Users") shall use the App in accordance with these Terms.

These Terms shall apply together with various guides, help documents, privacy policies, etc. (collectively "Individual Provisions") that the Company may present from time to time regarding the App. In case of conflict between Individual Provisions and these Terms, Individual Provisions shall take precedence.

Article 2 (Contract Formation and License)

1. Upon completion of downloading (or purchasing) the App, a usage contract based on these Terms shall be established between the User and the Company.

2. The Company grants Users a non-exclusive, non-transferable, non-sublicensable right to use the App within the scope necessary for its use.

3. The App is a one-time purchase type that can be used with a single purchase. Feature activation and restoration follow App Store mechanisms.

Article 3 (Age Requirements)

The App does not set age restrictions. However, purchases, payments, and account management shall follow the terms of use of each app store and applicable laws of each country. For purchases and use by minors, management and responsibility according to the laws of the applicable jurisdiction shall apply.

Article 4 (Fees, Purchases, and Refunds)

1. Fees, taxation, exchange rates, etc. shall follow App Store price lists and regulations.

2. Refunds, cancellations, etc. shall follow Apple (App Store) policies, and the Company shall not, in principle, provide individual refund support.

3. In the future, price revisions or paid additional features may be introduced, in which case notice will be given within the App or on the official website.

Article 5 (User Content Handling)

1. Users represent and warrant that they own or have obtained proper authorization for the necessary rights to text (words, meanings, notes), images, audio, CSV files, and other content (the "User Content") handled within the App.

2. User Content is primarily stored on the device (optionally in iCloud), and the Company does not receive, store, or view such content.

3. Users shall resolve disputes and claims arising with third parties regarding User Content at their own expense and responsibility, and shall not cause damage to the Company.

Article 6 (Prohibited Activities)

Users shall not engage in the following activities when using the App:

• 1. Acts that violate laws or public order and morals, or encourage criminal or illegal acts
• 2. Acts that infringe third parties' intellectual property rights, privacy, portrait rights, etc.
• 3. Reverse engineering, analysis, modification, reproduction, redistribution, or resale of the App
• 4. Unauthorized access, malware distribution, or acts that cause disadvantage to the Company or third parties
• 5. Acts that interfere with or impose excessive load on the App's operation or provision
• 6. Other acts that the Company reasonably deems inappropriate

Article 7 (Service Interruption, Changes, and Termination)

1. The Company may interrupt or suspend all or part of the App's provision without prior notice in the following cases:

• When performing system maintenance, updates, or security measures
• When provision becomes difficult due to natural disasters, power outages, communication failures, laws, or administrative guidance
• When the Company determines there are reasonable technical or operational reasons

2. The Company may change the App's content or terminate its provision with reasonable advance notice to Users (except in emergency cases).

Article 8 (Data Storage and Backup)

1. The App is designed for offline use, and learning data is stored on the device. Users shall back up their data at their own responsibility as needed through iCloud synchronization, CSV export, etc.

2. The Company shall not be liable for data loss caused by device failure, loss, initialization, OS or App malfunctions, user operation errors, etc., except in cases of intentional or gross negligence by the Company.

Article 9 (Disclaimer of Warranties)

The App is provided "AS IS." The Company makes no express or implied warranties that the App is free from factual or legal defects (including but not limited to safety, reliability, accuracy, completeness, validity, fitness for particular purposes, security, etc.).

Article 10 (Limitation of Liability)

1. The Company shall not be liable for any damages incurred by Users arising from the use of the App, except in cases of intentional or gross negligence by the Company.

2. Even when the Company is liable, the scope of such liability shall be limited to the amount actually paid by the User as consideration for the App in the 12 months immediately preceding the occurrence of the relevant event (in case of one-time purchase, the purchase amount). However, this limitation shall not apply where liability limitation is not permitted under consumer protection laws.

3. The App's learning functions and SRS are provided for educational purposes and do not provide professional advice in medicine, law, accounting, etc.

Article 11 (Intellectual Property Rights)

1. All rights related to the App (copyrights, trademark rights, intellectual property rights in programs, designs, etc.) belong to the Company or legitimate rights holders.

2. Users shall not use the App or its content beyond the scope expressly authorized in these Terms.

Article 12 (Changes to Terms)

1. The Company may change these Terms without individual user consent when there are reasonable grounds such as legal amendments, feature changes, operational necessity, or other reasonable reasons.

2. When changing the Terms, the Company shall notify Users within the App or on the official website, clearly indicating the effective date. If Users continue to use the App after the effective date, they shall be deemed to have agreed to the amended Terms.

Article 13 (Communication Methods)

Communications from the Company to Users shall be made through in-app display, the Company website, email, or other methods deemed appropriate by the Company. Communications from Users to the Company should be made by email to info@tangowrist.com.

Article 14 (Prohibition of Rights and Obligations Transfer)

Users may not assign, transfer, or provide as security their position under these Terms or rights and obligations based on these Terms to third parties without the Company's prior written consent. The Company may transfer its position and rights and obligations under these Terms to third parties in connection with business transfer of the App.

Article 15 (Severability)

If any provision of these Terms is deemed invalid or unenforceable, the remaining provisions shall continue to be fully effective.

Article 16 (Governing Law and Jurisdiction)

These Terms shall be governed by Japanese law. In case of disputes between the Company and Users regarding the App, Japanese courts with jurisdiction over the Company's head office location shall have exclusive agreed jurisdiction for the first instance.

Contact Information

Rumahsaku Corp.
E-mail: info@tangowrist.com