| 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. |
| Name | Character | Episodes |
|---|---|---|
| Ai Kayano | Maihime Shirayuki (voice) | 12 |
| Yoshitsugu Matsuoka | Retto Enjō (voice) | 12 |
| Rikiya Koyama | Narration (voice) | 12 |
| Ai Kakuma | Kirara Hoshino (voice) | 12 |
| Daisuke Kishio | Runba Luseine III (voice) | 12 |
| Shizuka Itoh | HokkoChu (voice) | 1 |