A female college student, An, is attacked by a thug on her way home from school. Shota and Kenji happen to be there and together they fight off the thugs, but Kenji gets injured in the process. An is grateful but also feels bad, so she takes him home and treats him. However, that is the beginning of a big mistake. An becomes the victim of the two men's nasty pranks. They make her change into a swimsuit and make her give them a double blow job, they break into her bath and insert their baby penises into her, and she ends up at their mercy...