Gachi Akuta is a dark fantasy manga about Ryo, a boy living in a brutal slum called the "Prison" beneath a wealthy floating city. After a girl gives him a mysterious tooth, he is framed and thrown to his death, but survives thanks to the tooth, which gives him strange powers. He joins a team of "Cleaners" who hunt monsters born from trash, seeking revenge against the rich society that cast him away. Readers enjoy the series for its gritty, fast-paced action, unique monster designs, and the catharsis of a downtrodden hero fighting a corrupt world with raw, bloody violence.