Oba Yôzô, a figure steeped in alienation, navigates life through layers of performance and concealed despair. Born into privilege, childhood bewilderment at perceived human deceit shapes his worldview, compelling him to cloak genuine emotion behind a shield of theatrical humor. This crafted persona—a survival tactic—blurs his inner chaos, allowing fragile coexistence within a society he views as inherently fraudulent.

A pivotal encounter with classmate Takeichi fractures Yôzô’s carefully maintained facade. Fearful of exposure, he manipulates their friendship, yet through Takeichi discovers art’s raw power. Van Gogh’s tormented brilliance mirrors his own anguish, channeled into self-portraits that externalize his fractured psyche. This fleeting catharsis crumbles upon his move to Tokyo, where dissolution awaits. Under the corrosive influence of Horiki, Yôzô plunges into hedonism—drugs, fleeting affairs, and hollow rebellion culminating in a botched double suicide. Survivor’s guilt deepens his existential void.

Seeking anchorage, he grasps at relationships offering transient refuge. Marriage to Yoshiko, whose unwavering trust contrasts his duplicity, collapses when her assault—witnessed yet unstopped—shatters their fragile bond. Trauma propels Yôzô into narcotic oblivion, culminating in morphine addiction and institutional confinement. Post-release, he exists in spectral detachment, emotions numbed, resigned to meaninglessness.

His fragmented notebooks chronicle this unraveling: cyclical self-sabotage, gnawing guilt, and the chasm between hollow identity and societal demands. Themes of existential desolation and fractured selfhood intertwine, reflecting postwar Japan’s oppressive social fabric and psyche’s fragility.

Within the Aoi Bungaku Series, Yôzô’s arc remains tethered to Osamu Dazai’s source material—no expansions dilute his tragic trajectory. The narrative’s focus persists on psychological erosion, a life fragmented by external forces and internal collapse.