Living in the lower floor of the apartment building, Hirai visits Momoko Isshiki's home after his wife suddenly leaves home. As loneliness from his wife's absence grows, so do his emotions during their long-overdue conversation with Momoko. Overwhelmed by her kindness, he loses control and forcefully pins her down. Initially confused by Hirai's uncontrollable instincts—especially after not seeing her own husband in a while—Momoko gradually begins responding to his advances. Awakening to pleasures long forgotten, new desires begin stirring within her. Before long, she starts craving Hirai's body as well.