After a marital argument, his wife returns to her parents' home, leaving Kishi at a loss. Suddenly, his sister-in-law, Ayano, shows up unannounced. Worried about their troubled marriage, Ayano offers to help them reconcile. She constantly looks at Kishi with tender, upturned eyes, gently holding his hand and initiating affectionate physical contact. Though confused by her warmth, Kishi naturally finds himself becoming aroused. Ayano's approachable charm and subtly dependent nature begin to stir emotions within him.