Formerly a member of an illegal special forces unit, Elina was deeply shaken by the unit's brutal actions, leading her to escape and use her combat skills and regenerative abilities to secretly protect the city as a vigilante heroine. In her daily life, she lived peacefully with her boyfriend, Satoru. Meanwhile, Colonel Magnesion, the former leader of the unit, harbored ambitions to create the ultimate living weapon by implanting the indestructible metal Evernium into his body. As members of the special forces unit vanished one by one, his target finally turned to Elina—Lady Marvelous.