A period of boredom hits after four years of marriage. Ami, a wife who spends her lonely daytime alone, tutors Uchimura, a student retaking entrance exams who lives next door, three times a week. Ami just wants to support Uchimura as he studies hard towards his dream, but her Kokoro ignites Uchimura's desire. Ami puts on lipstick for the first time in a long while to go to a class reunion... On the way back, she bumps into Uchimura in the hallway of the apartment building and their lips accidentally touch. Since then, Uchimura's desire continues to accelerate, and in the afternoons when her husband is not around...