Yoshio, a 24-year-old from Saidaiji in Okayama Prefecture, migrates to Tokyo chasing bohemian dreams, initially brandishing a guitar as an emblem of artistic aspirations. Financial instability and urban harshness shatter his ideals, compelling him to sell the instrument and embrace precarious day labor in civil construction amid Japan’s 1980s economic surge. Sporadic employment plunges him into extreme poverty, confining him to Dokudami-sou—a crumbling apartment complex with communal facilities and scant amenities.

He has a sister, Miyuki Hori, though their relationship is sparsely detailed. His days intertwine with marginalized figures—yakuza, addicts, and alcoholics—mirroring Tokyo’s underground subcultures. His childlike enthusiasm and persistent optimism draw him into encounters with women, occasionally veering into morally ambiguous or surreal episodes, including brushes with supernatural entities.

Binge drinking consumes his free time, regularly leaving him unconscious in alleys or parks. Yet he displays flashes of empathy and normalcy in interactions, tempering his sexually frustrated impulses with sincere human bonds. His story traces a gradual acclimation to destitution without substantial transformation, his existence defined by transient struggles over lasting change.

Adaptations, including the 1988 live-action film, maintain narrative consistency, highlighting economic precarity, social alienation, and ephemeral bonds. His journey unfolds through episodic trials rather than linear progression, his conditions remaining unchanged across media iterations.