Osamu Dazai's No Longer Human: The Manga Edition

Oba is tormented by a failure to find any value in himself or in human relationships, despite being surrounded by women who love him. He creates the persona of a buffoon who mocks himself while entertaining others. But inside he is tortured, and as he moves from childhood to adulthood he becomes addicted to sex and alcohol. Largely autobiographical, No Longer Human explores Dazai's own sense of failure and alienation which drove him to self-destruct with alcohol and numerous suicide attempts.

(Source: Tuttle Publishing)