Ayano, the mother of Shin, lost her husband while Shin was still in school and raised him single-handedly with great sacrifice. When Shin enters university, Ayano begins considering remarriage to Miyakawa, her company's supervisor. Meanwhile, Shin harbors special feelings for his mother—wishing for her happiness, yet struggling to accept her relationship with Miyakawa. One night, lured by the sound of Ayano's breathing from her bedroom, Shin quietly enters. Seeing his mother's cleavage exposed as she sleeps, he gently runs his fingers across her skin. A story of an intimate night that deepens the bond between mother and son.