Akito is a man worn down by years of working at a exploitative corporation. He quits his job and becomes a full‑time househusband, supporting his busy wife, Tsukiko. Though he tries to find purpose in domestic chores, he remains restless and unfulfilled. One day, a lost item unexpectedly leads him to a chance reunion with a married woman—a housewife who is also searching for something missing in her daily life. That encounter sparks a forbidden, downward‑spiraling affair between two people who no longer fit the roles society gave them. Set in a contemporary Japanese suburban environment, the story traces the emotional and physical entanglement of a househusband and a housewife as they descend into an illicit relationship, exploring themes of dissatisfaction, loneliness, and the consequences of breaking marital boundaries. The narrative, which spans five volumes, follows the gradual erosion of their ordinary lives and the moral compromises they make along the way.