Set 10 years after "Kids Return." Shinji and Masaru have graduated from high school with different paths in their lives. Shinji attempted to become boxer and Masaru a yakuza. They both tried to rise to the top of their respective fields.

Kids Return is a movie about two high school friends, Shinji and Masaru, who are both struggling with their lives. Shinji joins a boxing gym and becomes a successful boxer, while Masaru becomes involved with the yakuza. The movie explores their separate journeys and how their choices ultimately shape their futures.