Our hero is an angel, who actually loves sex, SM, and all that fun stuff. Unfortunately, he has no chance in heaven with these pure angelic girls around. His eternal life is spent in agony and pent-up frustration. One day, the daughters of the devil are captured, and our hero is ordered to rehabilitate them. He is ecstatic with the idea of being able to havethese girls all to himself to sexually abuse and train them all in the name of rehabilitation!

There are a total of 4 demon daughters for your sex-slave training: 1The quiet and proper princess of the duke of hell. 2 The devil's defiant daughter. 3 The devil's quiet shrine maiden. 4 The daughter of a royal and very exotic family line, who is still a virgin: 4 very different types! It's up to you (the player) to decide if you will submit these girls to the torment of sexual slave-training to become obedient to your every wish, or whether you will treat them with love and compassion.

[From gamelexgs]