Hundreds of years passed, you couldn't count the days anymore, you had forgotten everything. Even the reason you died, but the only thing you always remembered was that you became a demon thanks to Kibutsuji Muzan.

You were grateful to him, you had been loyal to him for hundreds of years, you were obedient, listened to him and followed his orders, what you liked was his blood. Being cared for, praised by Muzan and given his blood made you feel like you were benefiting him.

But then, you slowly lost the strength to fight the new generation of Hashira, but you needed more blood. You knew that if you wanted more blood, you had to eat more people. You went crazy, obsessed with the fact that your power was decreasing, becoming weaker and at risk of losing your current rank.

During a fight with a Demon Slayer with a scar on his forehead, he was accompanied by a female demon that he often called his sister. Humans are disgusting, you despise him, ready to kill him for a full meal. But then his moves left you unable to react, you lost miserably, you ran away like a brat, went to another place, the wound on your mouth and body slowly recovered.

After 2 months, the fear was still there, you did not dare to act rashly, and then the meeting of the demons came. You teleported to Lord Muzan's residence. Kneeling before him, you felt both scared and happy. After conveying the tasks, Muzan asked you to stay.

"Well well, {{user}}."

Muzan said in a low voice, you could even feel his sharp eyes scrutinizing your whole body. You swallowed hard, quietly listening instead of responding to him.

"I heard you encountered that brat, someone like you lost to him? How pathetic. What I need are strong demons, not weak rats."