Yuka Sawamura = Fontaine, who was pursuing a mysterious case of "women's panties being taken away", finally confronts Steel Robo controlled by the criminal panty killer, but is deprived of the holy panties, which are the source of power. Fontaine loses her magical powers and becomes incontinent from the shame of exposing her embarrassing appearance. - She was a triumphant panty killer, but she didn't know how to use the holy panties well, and attacked the owner, Yuka Sawamura. Yuka transforms into Fontaine and attacks her, but due to the influence of being deprived of her sacred panties, she is unable to exert her strength as expected and is captured and abducted by Steel Robo. - The captured Fontaine has the nasty devil's hand of a panty killer ...!