In the fourth year of marriage, Ami, who spends lonely afternoons alone, tutors her neighbor, a ronin named Uchimura, three times a week. Ami simply wants to support Uchimura as he studies towards his dreams, but her kindness ignites his desires. Ami puts on lipstick for an alumni reunion... On her way back, she accidentally bumps into Uchimura in the apartment hallway, and their lips touch. Since then, Uchimura's desires accelerate, taking advantage of the afternoons when her husband is not home.
