Aya is so sensitive that she climaxes quickly. When Aya climaxes, the couple reaches their limit and stops having sex. The husband is not satisfied with their married life, and one day, he bumps into a man from his former part-time job and they go out drinking. However, Tachibana is also a man. Because he is drunk, he becomes excited by Aya's defenseless eroticism, and even though he feels bad for Tomoki, he ends up raping her. However, despite being raped, an indescribable feeling begins to grow in Aya. On another day, Tachibana continues to have sex with Aya. Aya is getting more and more addicted to Aya's sexual acts. When Tomoki comes home from work, he witnesses Tachibana and Aya's relationship, but he is too timid to say anything. Aya is unable to tell anyone about her gradually changing relationship with Tachibana, but her husband is frustrated by Aya's increasingly violent behavior, and he becomes addicted to Aya's sexual acts.