Oga Tatsumi, a delinquent student at Ishiki Demon High School, has an undefeated record in fights, so he is called a devil by those around him. One time when they were fighting by the river, they met an uncle floating from upstream. After Oga brought the uncle ashore, the uncle suddenly split into two halves. While he was shocked, he discovered a baby inside the uncle. Who knew that this baby turned out to be the future demon king from the demon world - the son of the demon king! Oga also inexplicably became the father of the Demon King, and began an extraordinary life from then on.
And his sister is even more extraordinary. . . . . . . . . .
Start a sweet and funny love story