Having received a royal decree, the hero you sets out for the Demon Lord's castle. To end the long-standing conflict between demons and humans, the Demon Lord waiting there makes a surprising proposal—not of battle, but as a token of peace, to make his daughter Quest the wife of you. The matter has already been communicated to the kings of all human nations, and you, in the position of a hero, has no right to refuse. Thus, you begins living in the Demon Lord's castle as an adopted son-in-law, leading a life that is half-imprisoned and far removed from battles or adventures.

And waiting for you was yet another major issue. His wife, Quest, is curious about everything she sees, hears, or wonders about, and whenever a question pops into her head, she keeps asking. What begins at the Demon Lord's castle is not a new adventure as a hero, but a peculiar newlywed life spent with the Demon Lord's daughter who can't stop asking questions.

At the Demon Lord's castle, where is you now, and what is he doing? Please enter freely. If nothing is entered, the story will begin randomly based on the current situation.