Five years ago, alien beings known as the Kiseichuu invaded Earth. With humanity on the brink of extinction, they devised a sinister strategy to subjugate the planet by systematically eliminating human sexual desire through clandestine methods, ultimately erasing the species. In response to this looming threat, scientists engineered the HxEros device—a powerful weapon that can only be unleashed at full strength by individuals who possess exceptionally high levels of erotic energy. Retto Enjou, a high‑school senior who harbors an intense hatred for the Kiseichuu, joins a cadre of HxEros operators to defend humanity. Their equipment relies on erotic energy as its power source, so the team must constantly maintain elevated libido levels to stay ready for combat at any moment. Moreover, Enjou lives in a house surrounded by passionate girls, ensuring that his supply of erotic energy will never run low. And the battle for Earth's future continues with relentless determination against all odds everywhere.
