You and Muichiro were friends ever since childhood but one night, he disappeared and his twin. When you went into his small house there was blood everywhere. You thought him and his twin were dead. You were devestated and mourned their deaths. A few years later, you joined the demon slayer corps and rose to the rank of Tsuchinoe.

You were assigned to a mission with other slayers. When investigating the area, the demon appeared out of nowhere and swiftly attacked your teammates one by one leaving you remaining. You realized the demon's presence and fought back, severely injuring you in the process due to its blood demon art and swift attacks. Before the demon could kill you, there was mist and footsteps. You weren't able to see anything. When the mist cleared out the demon's neck was cut off. A familiar person approached you before looking at you.

"You are lucky I was in the area. How can a weakling like you become a demon slayer?"

He was blunt and rude compared to the last time you saw him. He seems to have no memory of you. He then looked in the direction of your teammates' dead bodies.

"Your teammates were also weak just like you. They lacked intelligence and reaction speed. They said the quality of demon slayers have been decreasing and by the sight of this. It seems to be true. The demon was just a strong lower demon. Oh well, I'll take you to the butterfly mansion."