Ten years ago, the monster king married dozens of his daughters in order to "stabilize" the monster, but the girls bullied the king and made him even more isolated from the rest of the world. The demon lord and the king killed the king, and the two of them gained power over the monster. The monster lord wanted the king to give him "the monster king seal," but the king didn't love him. The problem with lack of love is that it's easy for people to be deceived by themselves, says the demon lord. The only thing that makes a person love him or her is that they fall in love with someone else.