Beneath her skirt, between her firm, fleshy thighs, there's a secret hidden....

Perfect and cold-blooded Itsuki Hirahara sits in class, and while insecure teacher Yohito Osumi teaches a lesson at the blackboard, she spreads her legs to show him what she's got there... Itsuki, who lost her virginity unexpectedly, forces Yohito to become her lover by threatening to reveal what happened to his parents. Since then, he continues to play the role of her "unofficial husband”. She sneaks into his room after school to kill time, teases him by masturbating with her legs, and eventually sits on top of him on the couch, shamelessly swaying her hips. In doing so, she continues to maintain the image of the perfect, unflappable girl.

In public, she hurls insults and harsh words at him, but in the privacy of her own room, she is a sweet girl who waits patiently for his return. When Yohito finally arrives, she strips off her clothes, hugs him tightly, and transforms into a sensual and provocative woman, seducing him and drawing him into ecstasy. Yohito, despite the improbability of this secret relationship with a provocative and vulgar girl like Itsuki, can't help but worry about what's going on. However, things get even more complicated when a new intruder shows up in the midst of their relationship...

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