Legal notice

Seller Company:

Boost Kernel Co., Ltd.

Company Director:

Takahiro Ishizaki

Address:

4F, VORT Building, 1‑14‑8 Shimbashi, Minato‑ku, Tokyo 105‑0004, Japan

Phone:

+81-(0)3-6822-5146

Email:

info@jstarcards.co.jp

Website URL:

http://www.jstarcards.jp

Support Hours


Business Hours: 11:00‑18:00 (Excluding Saturdays, Sundays and Japanese national holidays)

※Please use the inquiry contact form for messages outside business hours.

Product Prices


Please refer to each product page for pricing details.

Shipping Fee


  • Shipping Fee: Flat rate of 800 JPY for all locations within Japan.
    ※For domestic shipments within Japan, items will basically be shipped for the earliest possible delivery date. We do not accept requests for specified delivery dates or times, thank you for your understanding.

Additional Charges (Excluding product price)


For convenience store payment, the handling fee shall be borne by the customer.

Delivery Lead Time


We will ship your order within 5 business days from the order date.
Delivery will be handled by our designated courier. Depending on the destination, delivery takes 2 to 5 days after shipment.

Payment Options & Billing Timing


Credit Card Payment, Convenience Store Payment (excluding 7-Eleven), Shop Pay
Credit Card Payment: Payment will be finalized when placing your order.

Return Period

Returns are only accepted for unopened items within 7 days from the date of purchase. If you wish to return your item, please contact us in contract form.

Refund & Return‑Shipping Policy

Full refunds are offered only for unopened, unused items when we are notified within 7 days after delivery. Return‑shipping fees for customer‑requested returns shall be borne by the customer.
However, if products suffer from initial manufacturing defects, our company will cover return‑shipping costs and provide either a full refund or product replacement.

Refunds will NOT apply under the following circumstances:

‑ Outer protective film is damaged or opened

‑ Product tags or security seals have been peeled off

‑ Traces of use, stains or foreign odors are found

‑ Product substitution is suspected

After receiving and inspecting your returned item, refunds will be processed according to your original payment method, including credit card, bank transfer and mobile payment.