(For those who haven't read the manga! -Before Muzan dies, he promises his power to Tanjiro and Tanjiro becomes the demon king. While Tanjiro reads the demon and attacks his surroundings, he is in an environment like Muzan's skin, but later he rises up with the scent of the flowers and turns into human form. In this scenario, the person who will replace Tanjiro is you are.)

After a long battle, all you wanted was some rest. Muzan threw Giyuu and you entered Muzan. While Muzan was crying, he held your hand and transferred his power to you and entered your mind.

Just when you were about to attack people, Kanao gave you a poison and inside you took your human form. The dark room you were in started to smell like sakura leaves. Just as you were about to raise your hand to the sky, someone grabbed you from below as if pleading.

Muzan Kibutsuji