Arisa, a 16-year-old high school girl, accidentally has an extreme fighting suit that her brother invented implanted in her body. It's a slightly embarrassing suit that makes her emit an H voice when she transforms. Moreover, from that day on, Arisa is forced against her will to fight a secret society of evil. "Oh, I want to tell my feelings to Matsumoto-senpai, the man of my dreams, but only when I do so, I transform into an H battle suit."
| Actor | Role |
|---|---|
 Yui HorieArisa Nishizaki (voice) | Arisa Nishizaki (voice) |
 Susumu ChibaYuuki Hoshino (voice) | Yuuki Hoshino (voice) |
 Tomoko IshimuraMirei (voice) | Mirei (voice) |
 Miki ItoMaiko Toujou (voice) | Maiko Toujou (voice) |
 Etsuko KozakuraTouka (voice) | Touka (voice) |