Hiromitsu Kitayama will release a new double A-side single, "1/∞ ~One Infinity~ / BACKLASH," on December 9.

The single features two contrasting tracks. "1/∞ ~One Infinity~" is a winter ballad, while "BACKLASH" serves as the opening theme for the second season of the television anime Tougen Anki, specifically its Nikko and Kegon Falls arc. "BACKLASH" has already been released digitally.

The single will be available in three editions. Limited Edition A includes a Blu-ray or DVD featuring the music video for "BACKLASH" and behind-the-scenes footage. Limited Edition B comes with a visual book, while the Regular Edition includes an additional new coupling track.

First-press copies of all three editions will also contain a serial number allowing fans to apply for a special talk event. Further details, including the event date and schedule, will be announced at a later time.

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Limited Edition A

CD

1. 1/∞ ~One Infinity~
2. BACKLASH
3. 1/∞ ~One Infinity~ - Instrumental
4. BACKLASH - Instrumental

Blu-ray / DVD

1. BACKLASH (Official Music Video)
2. BACKLASH (Official Music Video) Behind The Scenes

Limited Edition BB

CD

1. 1/∞ ~One Infinity~
2. BACKLASH
3. 1/∞ ~One Infinity~ - Instrumental
4. BACKLASH - Instrumental

Regular Edition

CD

1. 1/∞ ~One Infinity~
2. BACKLASH
3. Coupling Track (Regular Edition Only)
4. 1/∞ ~One Infinity~ - Instrumental
5. BACKLASH - Instrumental
6. Coupling Track - Instrumental (Regular Edition Only)