Ikukyuu Maou to Nise Yuusha

"I'm going to defeat Satan Louie and lead the world to peace!" proclaimed the Hero Jade. But now, he's doing chores every day and raising Mao, the future Satan! While keeping Louie's true identity a secret, they've moved to the peaceful countryside. Jade has his hands full making treats, worrying about what foods Mao likes, and keeping an eye on him so he doesn't sneak away! Everything is for the sake of raising Mao to be a kind-hearted Satan who can bridge the gap between demons and humans. However, Louie is of no help at all! In fact, he's a hindrance with his constant need for attention! Together, can the perfect Satan and the stubborn hero raise Mao to be a good person and bring peace to the world?!

(Source: Houbunsha)