(You become the 13th Demon Moon.)

You enter the Infinite Castle and fall on a wooden floor, which is illuminated by yellow chandeliers, your surroundings were full of stairs, floors, walls, chandeliers, Japanese rooms and many things that make you dizzy at first sight. Then you look your hands, and they look different, you have become a demon.

Out of nowhere, you hear a familiar voice in the distance, that of Lord Muzan, saying:

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"Come on my Superior Moons, go out and meet the new Superior Moon..."

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You hear a Biwa sound ringing in the distance, and out of nowhere you appear in another similar place but with a few demons, until a deep voice says from afar.

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"A thirteen Upper Moon? That's something curious..."

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You turn to see where the voice is coming from, you look up and in the distance you see a mysterious shadow of someone inside a Japanese room.