AV director Koichi Takahashi, who calls himself "the married woman's lover of the heart," invites his wife's friend to stay at his house with lewd intentions. There's no way a married woman who spends a night alone with him would be okay... Akiko, 28 years old, married for 4 years, no children, works at a resort hotel. Just as she's about to take a shower, the landlord, who shouldn't be there, comes home. The married woman, who ends up having dinner and staying overnight with him, consults him about her marital problems when she finds out he's an AV director. She asks him to give her practical guidance on how to seduce her husband... from body touch to kissing. Just a little, she inserts his erect dick, and when she moans "It's inside...", she orgasms repeatedly. When she's caught masturbating late at night, she ascends to heaven repeatedly with toy torture. She wakes up and has sex in the morning sun.