Kessei, HxEros (E02)

Earth faces an unprecedented threat from an invasion by the mysterious Kiseichuu. The Kiseichuu feed on human sexual energy, also known as “H-energy”, and weaken the human population. High school student Retto Enjo is a member of the hero group HXEROS, who fight together to save the earth from the Kiseichuu. (Crunchyroll)