Includes the new song ""1/∞" ~One Infinity~," a ballad number perfect for the winter season, and "BACKLASH," the opening theme song for the second season of the TV anime "Tougen Anki" -Nikko Kegon Falls Arc-.
A double A-side single featuring two title tracks, each with a different theme and worldview.

Product Information
『1/∞』~One Infinity~ / BACKLASH
Standard Edition ＜CD＞
1,430 JPY (Tax included) / PCCA-06592

Special Offer Information
【Press Bonus】
Special Campaign Application Lottery Serial Number

Serial numbers can be used to apply for the following bonuses.
·HK Prize: Hiromitsu Kitayama Special Talk Event
·All Applicants Bonus: Original Video

*For the HK Prize, Hiromitsu Kitayama will take the stage and hold a talk event.
*Details of the campaign will be announced on the official website at a later date.
*Three serial numbers are required for one entry into the campaign.
*Please note that application for and participation in this talk event are restricted to residents of Japan. Thank you for your understanding.

Product specifications
Limited First Press Specifications: Sleeve jacket
Lyrics booklet

Contents
【CD】
1. 『1/∞』~One Infinity~
2. BACKLASH
3. Coupling
4. 『1/∞』~One Infinity~ - Instrumental
5. BACKLASH - Instrumental
6. Coupling - Instrumental

Release Date
Wednesday, December 9, 2026

Pre-order Period
Wednesday, October 21, 2026, 6:00 p.m. JST to Wednesday, December 2, 2026, 9:59 p.m. JST

Delivery
If you purchase this product during the pre-order period, it is estimated to be delivered on Wednesday, December 9, 2026 (excluding Japan’s remote islands and overseas shipping).

*Orders and payments made after the pre-order sales period will be shipped sequentially after the release date.
*Depending on the payment method, it may take some time for the data to be reflected, and even if you make a reservation during the reservation period, the purchase may not be completed until the next day, so please complete the procedure as soon as possible.
*If you order this item along with other items, they will be delivered as soon as they are ready, so they may not be delivered in time for the release date. For more details, please check the latest estimated delivery date displayed in your cart.
*Due to unavoidable circumstances (natural disasters, bad weather, social conditions, etc.), the estimated delivery date may change. Please be aware of this before purchasing.

Other Notes
*This page is for the Standard Edition only.
*Please click here to purchase items with store-specific bonuses, First Press Limited Edition A, or First Press Limited Edition B.
*The color and design of the product image may differ from the actual product.

For those using payment methods other than credit cards
Payment methods other than credit card (immediate payment) will be shipped after payment is confirmed, so please be sure to complete the payment procedure by the deadline stated in the email sent after completing your order.
*Please note that if you select bank transfer and complete the transfer procedure on a weekday night or on a Saturday, Sunday, or holiday, the payment may be received the next business day depending on the circumstances of your financial institution.

Publisher / Distributor
PONY CANYON INC.

Credits
(C)(P) RED ON