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In the modern day world, there is one who is born as the Maou (demon king) and one who is born as the Yuusha (hero). It's said that the hero is to defeat the demon king in both body and soul before the demon king tries to take over the world, but nowadays who really believe in this stuff. Certainly not Mao who just so happens to be the reborn demon king. However, even though he has strange powers which makes other bad-guy type people fall for him, he has no intention of taking over the world.

One day the hero, Kamiko reaches Mao's office and notices right away that he is the demon king but in order to test this theory - he kisses him! Mao just wants to get this defeat over with and go back to his daily life but when Kamiko seizes his company and says it's not going to be that easy. Mao's life is turned upside down and now they live together and Kamiko keeps insisting that the only way to be defeated properly is to have sex!

(Source: LuffyNoTomo)

A world where demons prevail and humans are rare. Hiyori, a human, is considered to be delicious to demons. However, his classmate, Hodaka, a pushy big-horned demon, found out his secret. On top of that, he kissed and tasted him…Charming a demon---a troublesome situation?! Surrendering to one's instinct and pleasure leads to…

(Source: MU)