Five years after the Kiseichuu invaded Earth, out to wipe out humanity by draining the life force tied to sexual desire, high schooler Retto Enjou still carries the attack that left his childhood friend Kirara Hoshino shut off from the world. He joins Kirara and three other members of an elite HxEros unit, living together in a shared dorm while learning to weaponize their own erotic energy against the invaders. Kitada Ryouma's manga plays the premise for comedy as much as action.