Ayame and her sister know that their dad's been lonely ever since their mom left home. Like any good daughter, they just want their dad to be happy and help in any way possible. And we do mean, Any. Way. Possible.
Takato Keisuke and six females are locked up in a dungeon underground. According to the rules, the only way to escape from this place is to rape all six of them. One by one. Can they escape from here and go back to being normal? Or is this going to change them for the worse?