One day, a devil, which has been sealed up for a long period of time, suddenly comes out and starts destroying the world. To prevent him from coming back to life completely, humans need to protect the magical school, which keeps the soul of the devil. The key to fighting against the devil is inexperienced soldiers since they will absorb the power when they have sex with someone powerful. The main character is the one who injects the power... New game in the slave training game series by KISS. Now a tower defence game.