Aya is too sensitive and cums easily. As for the couple's activities, once Aya cums, she reaches her limit and quits having sex. Her husband was not satisfied with their married life, and in the meantime, she bumped into a man she used to work for part-time and they ended up having drinks. However, Tachibana is also a man. Because he was drunk, he felt aroused by the defenseless eroticism of a drunken Aya, and even though he thought it was bad for Tomoki, he committed a crime. However, despite being raped, Aya develops this feeling that she cannot describe. Tachibana continues the act with Aya on another day. Aya is stuck in a quagmire Tomoki witnesses the relationship between Tachibana and Aya when she returns from work, but she is too timid to say anything about her sexual behavior with Tachibana, and Aya gradually changes about her relationship with Tachibana. Although she was unable to say anything, her husband became addicted to Aya's sexual acts, even though he was frustrated by Aya's violently changing behavior.