The last survivor of planet Ryuryu-ju, a woman named Ekkusu Kurameru. As her clan faces extinction due to their fate of possessing highly acidic bodily fluids, her final hope lies with a superhero active on a small blue planet in the outer galaxy—Mighty Boy. His mission is to defend against outside threats and protect the planet. But then, a mysterious woman dressed entirely in black suddenly appears, asking, "Won't you let me carry your seed?" She wields Cosmo Rare Metal—the one substance capable of exploiting Mighty Boy's sole weakness. Taking full control of the beautiful young hero's body, she strips him of all freedom. And in the end… BAD END.