On Awakening Day in the third year of high school, Wang Gang awakens the F-grade ability recognized by the entire school as the most useless—"Maidenization", and is mocked by everyone. Little does he know that this ability can not only seal the sequence abilities of others, but also turn fierce monsters into obedient beautiful beast-girl maidens! From an F-grade good-for-nothing to commander of a beast-girl legion, Wang Gang cuts a path through rifts and powerful enemies. But as the mysterious organization "Genesis Twilight" appears, a crisis sweeping across Star City quietly descends.