Seiran Island, the land of paradise, aka the land of filthy debauchery, where any sexual acts are permitted and enforced by the Pervert Law. Junnosuke, a transfer, is a virgin with pride who despises sex with no love. However, sex is a duty of the island residents! Virginity is a serious crime!! All those who refuse sex will get guillotined by the Future Seiran Homeland Organization (or FS)!!! Junnosuke decides to protect his virginity with his dear life, evading all perverts along with his young virgin sister, Asane. However, they run into Nanase Katagiri, the school's legendary virgin hunter #$%!*...!

Item creation to outsmart the FS, securing every escape route, and Nanase's home cooking that achieves perfect nutrition. With Nanase as their ally, Junnosuke and Masane begin their plan to destroy the perverted ordinance. And on Seiran Island, there were other girls besides them who were also struggling! Hinami Watarai, a virgin who is never propositioned for sex by anyone due to her youthful appearance! Azumi Misaki, a virgin with a terrifying libido, but who doesn't want to show her plump body to others! One day, a major incident befalls Hinami!?

To protect Hinami from the “Preschooler Man,” Junnosuke proudly declares himself part of the Anti-Copulation Force. However, despite appearances, Hinami turned out to be a full-fledged adult!! In the end, Junnosuke and his group had unwittingly sabotaged her chance at sex. Naturally, the sinister hand of FS draws near! He gives everything he’s got to flee, but after exhausting all his weapons, he finds himself in a desperate, do-or-die chastity crisis!! Just when all hope seems lost, a terrifying long-range sniper shot from a girl in a kimono saves Junnosuke from the brink!? And to make matters even more chaotic—Misaki, having heard the commotion, rushes to the scene...!!

Student Council President Touka Reizeiin declares the opening of the lewdest festival of all—“Athletic Cumpetition”! Seizing the opportunity, Junnosuke and his team plan a covert infiltration of the student council room to steal intel on "Fumino Kotoyose." But the lewd festival is no joke! Erotic competition! Erotic competition!! Erotic competition!!! Barely managing to cling to his virginity, Junnosuke presses on toward his true objective: the student council room. But waiting for him there is Misaki—making an epic anal contraction...!?