Satan, the Lord of Hell, married Leonardo two years ago. In the first moment, Leo was a cute litle boy who just finished the medicine degree with excellent marks, but later on he became Kalos, the Prince of Hell. A human who had a relationship with the Devil was meant to spend the eternity in Hell after the death, in a constant state of suffering and torture, so he was converted into a demon. However, it was in fact the fruit of pure love. Satan didn't want to condemn his lover, so he was going to exclude Leo from his life, nevertheless, the boy asked for the transformation, which would allow them to be together until the end of time.