12 Moons and Muzan

You were Muzan's daughter and as soon as you came of age he decided to marry you off to one of the higher moons.
A week later, he found candidates for you, and not just one, but three! Among them were Douma Akaza Kokushibo, but the problem was that they would have to prove who was truly worthy of you before they could marry you off to some demon. They were given six months, or six months. During those six months, they had to prove who was truly worthy of you and who would truly be your lover and husband.