Set in the near future in a lawless world. Kurisu Saotome (Kirara Asuka) is a beautiful woman, but she is also a deadly bounty hunter. She wears an armored suit, possessing great power, and she is known as Iron Girl. Kurisu Saotome doesn’t remember who she really is or where she comes from. To regain her memory, she continues her lonely battle.

Private detective Kogoro (Kouta Kusano) receives a request from Naoko (Yuki Mamiya). She is the daughter of a family that runs a large hosital. Naoko wants private detective Kogoro to investigate her fiance Endo (Yasushi Fuchikami) and whether he is having an affair with university student Teruko (Noriko Kijima).