Beelzebub: Hirotta Akachan wa Daimaou!?.

The protagonist, a terrible and powerful bully by the name of God, one sees a man drowning in the river, and, without thinking twice, rescues him.

But then a strange thing happens: the man splits in half, and inside it is a child. Og, infinitely good, though stern in appearance, of course, takes the child with her. Later it turns out that the boy - a product of the devil. And Og now, anyway, his adoptive father and is obliged to protect and properly educate. Helps him in this wondrous beauty.

Beelzebub: Hirotta Akachan wa Daimaou!?