After a ship accident during a school trip, several students wash up on a mysterious island infected with a fatal "estrus virus." Without regular intake of semen, the infected will die from uncontrollable arousal. The sole male on the island is Shota Tanaka, the overweight, glasses-wearing outcast nicknamed "Kimo Otoko" (ugly guy), who was constantly bullied by the girls in his class.

Initially disgusted and resistant, the girls—including the seemingly pure and aloof Akira (Aki), the timid Yumi, and the main bully ringleader Ai—have no choice but to turn to him for survival. As the virus intensifies their desires, even the proudest among them begin to crave his semen. Episode 1 shows Yumi and Akira gradually accepting him while Ai still resists. By Episode 2, Ai becomes hopelessly addicted, sparking jealousy and further depravity as the girls compete for his attention, leading to intense group encounters, restraint play, and complete sexual surrender.

Trapped with no immediate rescue in sight, the question remains: will they ever escape the island, or will endless creampie-filled days of breeding become their new reality? This dark hentai spin-off explores themes of revenge, addiction, and reversed social hierarchy through explicit, no-holds-barred action.

Based on the erotic game by Lune.