The protagonist, Minato, is left with his relatives due to his parents' overseas relocation. The one who takes him in is his cousin, Sayuri, whom he used to play with a long time ago. While Minato feels nostalgic about the past, he gradually becomes aware of Sayuri's development as a woman. One day, Sayuri discovers Minato digging through her underwear. As she confronts Minato regarding the act, he pops a boner... naturally, she takes care of it. As she continues with the erotic act, they both realize they have a fetish for scents, and eventually...