The premise is absurd on purpose: parasites that feed on sexual energy, fought by teenagers who have to get horny to power up their abilities. The show commits completely to this ridiculous logic and never winks at the camera about it. You're watching a genuine action series that treats "H-energy" as seriously as any other power system, which means the comedy lands because it's never about the show being self-aware. The ecchi exists to actually matter to the plot, not as window dressing. It's built for people who want their anime stupid in exactly the way it intends to be stupid, where the group dynamic matters more than any single joke landing.

Five years ago, alien invaders called Kiseichuu arrived on Earth and began feeding on human sexual energy, slowly weakening humanity's drive in a plan to wipe out the species. To counter them, a weapon called the HxEros device was built, and it reaches full strength only for users with high levels of erotic energy. High schooler Retto Enjou holds a deep hatred for the Kiseichuu. He and Kirara Hoshino, childhood friends who have grown apart, are pulled into a fight with a Censor Bug. After defeating it, they join a team of HxEros heroes. Since their gear runs on erotic power, the group has to keep their libido high to stay ready for battle, and living in a house full of lustful girls keeps Retto well supplied. The result is an ecchi romantic comedy mixing supernatural action with plenty of risqué humor.