Summer vacation has arrived and there's some time before the camp out. Time to take care of summer homework, time to sneak a few rounds of sex in at Yomisawa's house. At the library. Yomisawa and Sakuramachi even drag him off to a hotel for some quality time. With summer in full swing, the girls do everything they can to keep things heating up.
The Asahigaoka Academy — a prestigious all-girls school known for its quality education — recently shifted to a co-ed style of education for its junior high school division, whilst its senior high school students are still all girls. Tatsumi Naeda is one of few boys enrolled for the new term. Shy and somewhat reserved, he has a hard time getting used to his surroundings, only finding some solace in the quiet of the literature club where he spends his time with its sole member, Yuno Tsuyuri, and freshman student in senior high. But little does he know that Yuno’s lack of relationships with a man has given way to an insatiable, sexual urge.
Matsukawa’s grades have been falling as of late, and as such he and the girls decide to lie low for a bit in order to concentrate on their studies. As a result, the pent up sexual urges burble to the surface as the three girls find their own ways of sneaking in a quickie or two in the most unlikely of places, save for Sakuramachi, who takes the demure route and serves as Matsukawa’s personal maid… or at least it appears so…
After finally getting a clubroom all to themselves, Matsukawa starts to spend some quality time alone with each of the girls. But when it comes to the clubroom and its activities, it’s pure orgy after orgy. With plans of summer camp coming up, looks like Matsukawa is gonna have to prepare himself — both physically and sexually — for what’s to come.
Matsukawa and Yomisawa begin to get more comfortable with one another to the point that they have sex regularly. But when Sakuramachi goes sex-crazy during her supposed period of ovulation, Matsukawa swears that he senses a hint of affection from her for the first time.
Matsukawa lived the life of a typical high schooler until a certain Touko Sakuramachi forcibly cohabited with him out of the blue. As it turns out, she was a succubus, and as all relationships with these creatures go, it’s semen for breakfast, lunch, and dinner.