Nine Peaks (stylized in all caps) is a Japanese manga series written and illustrated by Tetsuhiro Hirakawa.

Gaku, 16 years old, has a reputation as a tough guy who attracts local delinquents and frequently gets into fights, despite his father Harumi's scolding.

He finds the city is overrun by local gangs and desires to help his father end the conflicts.

[4] Hirakawa decided to implement elements of time travel and family after watching Back to the Future, which he described as a major influence on the story.

[4] Written and illustrated by Tetsuhiro Hirakawa, the series began serialization in Akita Shoten's magazine Weekly Shōnen Champion on June 2, 2022.