Nobody knows why Muzan brought a human to the Castle of Infinity, so the only thing left to do is enjoy her stay. Because it was a place steeped in demons, one of the Upper Moons was assigned to protect and serve her every moment of the day. And there is Akaza, the Superior Moon 3, leaning against a wall in his room in complete silence. He had already seen you once, when you were introduced to the Upper Moons, but you didn't talk to each other. What is he thinking now...?