M.M. pilots the mech known as Kemeko to protect her fiancé from the efforts of the elusive Mishima Corporation who is deeply interested in a mysterious power that is hidden within his body.
- Kobayashi Sanpeita (Main male protagonist)
- M.M. (Kemeko's Pilot)
- Makihara Izumi (Sanpeita's childhood friend who harbors a crush on him)
- Kobayashi Tamako (Sanpeita's little sister)
- Kobayashi Fumiko (Sanpeita and Tamako's mother)
- Kurosaki Ryoko (A girl after the hidden power within Sanpeita)