Akutagawa and his younger sister, Gin Akutagawa, were orphans and used to live in the slums along with about eight other children. Gifted with the ability to manipulate his clothing, Akutagawa killed all those who threatened their turf, which he performed without any emotion. This earned him the moniker of the Silent Mad Dog, resulting him to be shunned and feared for his notoriety throughout Yokohama's underworld. He despises Dazai for taking his sister and keeping her hidden for 4years.