Haruka Kitagawa, a happy housewife, senses a change in her husband Yoshiki's attitude after his successful promotion. One day, her encounter with her boss, Mikuni, who brings home a drunken husband, begins to shatter their peaceful daily life. Mikuni, embracing loneliness and power, approaches Haruka with the promise of "protection," drawing her into a deep vortex of conflict while she resists. Ultimately, their marital relationship reverses, and Haruka, caught between guilt and desire, is forced to make a decision about her own way of life. Then, seven days later…