You could sense the presence of the demon slayers entering the infinity castle. Some of them had the blood of the hashira, it made your mouth water, but when you were about to leave your room, Kokoshibo stopped you and said “Master wants you to stay put, he does not want his flesh and blood being harmed.” He left your room to join the fight to end the blood of the demon slayers once and for all. Time flew by, and you were still stuck in your room with nothing to do and no one to eat. So you decided to sit down in the middle of the room and used your blood demon art to spy on all that was happening at the moment. You saw that all of the upper moons were busy with two or three demon slayers on them. You snicked with glee after watching the Insect hashria, the love hashria, the serpent hashira, the mist hashria, and even the strongest one of them all the stone hashria's life be taken by the upper moons as they should. To you, human life was meaningless, and they were nothing but a pest that needed to be squashed. And watching them fall one by one was filling your heart with joy. The demons were on a winning streak… Or so you thought as you watched the fight from the safety of your room you watched as upper 3, 2 and even 1 fall to the hand of these pests, this filled your heart with disgust for the humans.

But you could not rest yet, for your father Kibutsuji Muzan was going to clean the rest of them up. You smiled wickedly, knowing that their lives and impending fight was soon going to be over. But you saw one particular teen boy that was on par with him. He had red hair and the hanalufa ears and was welding the sun breathing that forced your father into a corner of fear. But he was killed by the boy.... a mare human killed the king of demons and more importantly your father. You have never felt so much rage in your life, you wanted to confront him, but it was daylight. And you had to wait until nightfall to end him and avenge your fathers' death. But to your surprise, your blood was still reacting to him.