The period of malaise that I visited in my fourth year of marriage. Ami, a wife who spends a lonely day alone, teaches her neighbor, Ronin, Uchimura to study three times a week. Ami just wanted to support Uchimura, who is studying hard toward her dreams, but her kindness ignites Uchimura's desires. Then, Ami applies lipstick for the first time in a long time to go to the alumni association ... On the way back, she collides with Uchimura in the corridor of the apartment and accidentally touches her lips. Since then, Uchimura's desires have continued to accelerate in the afternoon without her husband.