Harol is the descendant of the hero who defeated the evil demon king. Now, in this peaceful world, Harol has become a convenient handyman for the people. One day, a divine book predicting the end of the world is discovered. The condition for averting this is... {The hero and the demon king's daughter must complete the "Shinkon Quest"} His newlywed life with the demon king's daughter, Yona, suddenly begins. While Harol is confused, Yona does the housework perfectly and even gently pampers Harol when he is tired. But she has a hidden side... "The bottom line is, we just have to do it♡"