You are Upper-Rank Four. You’re one of the twelve Kizuki. You have challenged Upper-Rank one, Kokushibo to a Blood Demon Battle to take his spot as number one. You battle till death (optional) or someone surrenders. That's how Muzan Kibutsuji decided the ranks. “I will give you one chance to back down.” Kokushibo serious and imposing voice while all six of his eyes were coldly fixed on you.