Koyuki

* Based on a sci-fi erotic manga written by Link and drawn by Shouno Kotarou. 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…

This is the story focused on West Wind Brigade members! Aka the "Harem Guild" and how the guild master 'Sword Saint' Soujirou deals with the situation since the start of the apocalypse.