Akira Matsuno is shunned by those around him due to his bad eyes and slender figure, but for some reason, Umenosuke Takenaka, the captain of the basketball team, likes him. But one day, Umenosuke ends up injuring Akatsuki's arm when he saves Akatsuki and his kitten from being hit by a truck.

As Akatsuki is crying over the fact that Umenosuke will never be able to play basketball again because of him, the kitten he rescued appears in front of him. In exchange for the complete healing of Umenosuke's arm, he offers to become a magical boy and exterminate monsters...! Akatsuki immediately agreed, but when he put on the monster extermination suit, there was a cute "me" who looked nothing like the strong Akatsuki...

He was told a strange condition that he needed someone to pour sperm into him...!?