Construction worker Kumada (Kiryu) used to be a member of the popular band Uma no Hone 30 years ago. In a sudden turn of events, he moves into a low rent shared apartment. His roommate Yuka is an idol, but begins being friendly with when he says his job is related to music.

Chiku is a devastated and dangerous town with 5 gangs fighting fiercely. Mugen and the Amamiya Brothers clashed, leading to Mugen disbanding.