Akimi, who lives with her husband Masaya's parents, has come to Kokoro her father-in-law Yoshio, who lost his wife several years ago, and has come to trust him with kindness. However, Akimi is not aware that behind Yoshio's kindness lies a wolf's face, and she approaches him without being aware of it. And while Masaya is away, Akimi is raped by her father-in-law. However, Yoshio's persistent caresses, which hit the right spots, make Akimi herself begin to desire Yoshio...