Musho Boke: Choueki-tachi no Requiem

Hiro, a self-proclaimed former yakuza and outlaw YouTuber, goes to meet a man who has just been released from Osaka Prison after serving over a decade in prison. The man's name is Jinnai Sosuke. The story goes back to 1997, when they were working enthusiastically as members of the Tokushima-gumi gang... The story is set in Amagasaki, Hyogo Prefecture. The youth and repentance of a man who has just completed his prison sentence.

(Source: Akita Shoten, translated)