The Man-Killer Virus: a lethal disease that has eradicated 99.9% of the world's male population. Mizuhara Reito has been in cryogenic sleep for the past five years, leaving behind Tachibana Erisa, the girl of his dreams. When Reito awakens from the deep freeze, he emerges into a sex-crazed new world where he himself is the planet's most precious resource. Yuzu-sensei has a reward she wants to give Shota-in her bedroom! Before Shota can find out just what she wants to give him, Karen decides it's time he got to know his classmates a bit better. It's not long before he learns some private details about the hottest girls in his class!