Yoshiharu Amachi resides with his younger sister, Fukko, and their father, Shigeru Amachi, in a household defined by disarray and financial instability. Following the loss of their mother during childhood—likely due to divorce—the siblings navigate a domestic life steeped in absurdity, shaped by Shigeru’s reckless habits and reliance on gambling-derived income. Yoshiharu assumes a pragmatic role, striving to counteract the chaos instigated by his father’s impulsive decisions and Fukko’s mimicry of their parent’s immaturity.

Though positioned as the family’s stabilizing force, Yoshiharu occasionally reveals flashes of his father’s irreverent tendencies, particularly in moments of morbid or voyeuristic curiosity. This contradiction reflects the lingering impact of growing up without structured guidance, caught between societal expectations and his family’s rejection of conventional responsibility. The Amachi household thrives on spontaneity, funded by Shigeru’s gambling luck, enabling a lifestyle centered on leisure, alcohol, and trivial pursuits.

Yoshiharu’s sporadic attempts to impose order often clash with the collective whims of his relatives, emphasizing his precarious balance between latent normalcy and the absurdity of his environment. The series chronicles their escapades through fragmented, self-contained episodes prioritizing surreal humor over continuity or character progression, leaving Yoshiharu’s external relationships, age, and personal history unexplored.