Terms of service

Terms of Service


These Terms of Use (hereinafter referred to as the “Terms”) set forth the conditions for use of the online store and related services (hereinafter collectively referred to as the “Services”) operated by Boost Kernel Co., Ltd. (hereinafter referred to as the “Company”). Users of the Services (hereinafter referred to as the “User”) must read these Terms carefully before using the Services.

By accessing, browsing or using the Services, the User shall be deemed to have agreed to these Terms and the Company’s Privacy Policy. If you do not agree, you may not use the Services.

Article 1 (Application)

  1. These Terms shall apply to all matters related to the User’s use of the Services.
  2. The Company may revise these Terms as necessary. Revised Terms shall take effect upon publication on the Company’s website.

Article 2 (Eligibility and Accounts)

  1. By using the Services, the User warrants that they have reached the age of majority in their place of residence.
  2. When using the Services, Users may be required to provide email address, billing information, payment details and other necessary data. The User guarantees that such information is accurate and up‑to‑date.
  3. The User shall bear sole responsibility for maintaining their account. Users shall not assign, sell, lend or otherwise transfer their account to any third‑party.

Article 3 (Personal Information Handling)

  1. The Company shall properly process personal information obtained from Users in accordance with the Company’s separate Privacy Policy (link) and the Privacy Policy of Shopify, the platform used to deliver the Services (link).
  2. The User consents to the processing of personal information under the Company’s and Shopify’s respective Privacy Policies when using the Services.

Article 4 (Product Information)

  1. The Company endeavours to display product information accurately; however, colours and appearance may differ from the actual item depending on viewing environments.
  2. The Company does not guarantee that product quality, appearance or features will meet the User’s expectations.
  3. Product contents, specifications and prices may be modified or discontinued at the Company’s discretion without prior notice.

Article 5 (Orders)

  1. The User shall place purchase orders through the Company’s designated procedures.
  2. The Company may accept or reject orders in its sole discretion. A sales contract is formed only upon the Company sending order‑acceptance notification.
  3. Changes or cancellations after order placement may not be possible.
  4. Product returns and exchanges shall be governed by the Company’s Refund Policy.
  5. The User warrants that purchased goods are for personal or household use and shall not be resold commercially or exported.

Article 6 (Pricing and Payment)

  1. Product prices, discounts and promotions are subject to change without prior notice.
  2. Unless explicitly stated, displayed prices exclude taxes, shipping fees and customs duties.
  3. The User warrants that payment details are true and accurate and that the User holds valid authority to use the selected payment method.
  4. An order shall not be valid if payment authorisation fails.

Article 7 (Shipment and Delivery)

  1. Delivery times are estimates only. Delays may occur due to couriers, customs clearance, weather or other circumstances beyond the Company’s control.
  2. Title and risk of loss pass to the User once goods are handed over to the delivery carrier.

Article 8 (International Shipping)

  1. The Company may offer international shipping including to Southeast Asia. Serviceable destinations may change at any time subject to courier availability, local laws and customs regulations.
  2. International delivery times are estimates. Delays may arise from customs procedures, local logistics, weather, political conditions or other factors outside the Company’s control, for which the Company accepts no liability.
  3. Customs duties, import taxes, customs processing fees and other charges may apply to international shipments. Such costs shall be borne by the User unless otherwise specified.
  4. Title and risk of loss transfer to the User upon hand‑over to the domestic Japanese courier. The Company shall not be liable for goods detained, confiscated or returned at customs.
  5. The User shall check and comply with laws, import regulations and prohibited‑item rules of the destination country in advance. The Company is under no obligation to refund or reship goods that cannot be delivered due to the User’s non‑compliance.
  6. If goods are returned by couriers or local authorities during international shipment, all reshipping costs shall be borne by the User.

Article 9 (Intellectual Property Rights)

  1. Trademarks, images, texts, videos, designs and other intellectual property contained within the Services belong to the Company or its licensors.
  2. Users shall not reproduce, modify, distribute or publish such content without prior written approval from the Company. Violations may result in claims for damages.

Article 10 (Third‑Party Services and Links)

  1. The Services may contain links to external websites. The Company accepts no responsibility for third‑party content, accuracy or outcomes arising from their use.
  2. Users shall review and use external services at their own risk under the respective third‑party terms.

Article 11 (Use of Shopify)

  1. The Services are built and provided via the Shopify platform.
  2. The Company is the seller. Shopify bears no liability for transactions, product fulfilment, delivery, refunds or any related dealings.
  3. The User shall hold Shopify harmless from all claims and damages arising out of transactions with the Company.

Article 12 (Feedback)

Feedback submitted to the Company (reviews, suggestions etc.) may be used by the Company free of charge. The User warrants that submitted feedback does not infringe third‑party rights.

Article 13 (Prohibited Conduct)

  1. The User shall not engage in the following acts: ‑ Violations of applicable laws and regulations ‑ Infringement of intellectual property rights belonging to the Company or third parties ‑ Submission of false information ‑ Spamming, phishing or fraudulent activity ‑ Unauthorised access via bots, scrapers or similar tools ‑ Any conduct that disrupts the operation of the Services
  2. The Company may take measures including account suspension if a User is found in breach.

Article 14 (Disclaimer of Warranties)

  1. Information on the Services is provided for general reference only and is not guaranteed to be accurate or complete.
  2. To the extent permitted by law, the Company excludes all liability for damages arising from use of the Services.

Article 15 (Limitation of Liability)

  1. To the fullest extent permitted by applicable law, the Company shall not be liable for lost profits, data loss, indirect or consequential damages.

Article 16 (Indemnification)

  1. The User shall indemnify the Company against any losses incurred as a result of breach of these Terms by the User.

Article 17 (Exclusion of Anti‑Social Forces)

  1. The User represents and warrants that they are not affiliated with any anti‑social forces and maintain no connections with such entities.

Article 18 (Force Majeure)

The Company shall not be liable where provision of the Services becomes difficult due to events beyond reasonable control including natural disasters, war, terrorism, pandemics, changes in legislation and communication failures.

Article 19 (Severability)

  1. If any provision of these Terms is held invalid, the remaining provisions shall remain in full force and effect.

Article 20 (Assignment)

  1. The User may not assign rights or obligations under these Terms to any third‑party without prior written consent from the Company.

Article 21 (Governing Law and Jurisdiction)

  1. These Terms are governed by the laws of Japan. The courts having jurisdiction over the registered head office of the Company shall have exclusive agreed jurisdiction.

Article 22 (Contact)

For inquiries regarding these Terms, please contact: Boost Kernel Co., Ltd. info@jstarcards.co.jp 4F VORT Building, 1‑14‑8 Shimbashi, Minato‑ku, Tokyo 105‑0004, Japan Tel: 03‑6681‑4659 Corporate Number: 9011001119068