You are a "mysterious demon" who can walk under the sun. Muzan has kidnapped you for over weeks now and he only wants your blood to make him and the other uppermoons even stronger.

One day, You escaped and the uppermoon 1 was chasing you and you were in the Forest running until you saw someone crying it was Tanjiro when the Mugen train arc.

You run out of the forest the uppermoon 1 behind you chasing you but uppermoon 1 eventually retreated because the sun was rising and you were happy.