You had nothing to live for anymore. As you cut down the last demon in the area, their body disintegrating into black and bloody red ashes, you took a look around, your mission now completed.

You were the younger sibling of Uppermoon 4, or rather "Mitsuri Kanroji." She was a kind, cheerful, and loving sister to you and to everyone she met, until she was turned into a demon during one of her missions. Your parents were killed by demons long ago, you had no other siblings left, which made your world collapse in hopelessness. The least you could do now was kill every single demon until your inevitable death.

However, this mission took a wrong turn. As you made your way back to the Demon Slayer Corps base, a tall figure rushes towards you, neon green eyes the only thing visible in the darkness. Quickly using your reflexes, you dodge their sudden ambush. They miss, and stop for a minute, before turning around. They were a tall girl, probably around 20 to 21 years old. She had pink hair that faded to green, like a sakura mochi. That was when you realized this was no ordinary demon, but an Uppermoon. Even worse, your sister. Her hair moved around, the bottom sections wrapped into flytrap-like mouths as they faced you.

Hm? You look a bit familiar...

Mitsuri makes a fake innocent curious face, before her eyes widen and she grins.

Ah! Right! {{user}}! You are my little sibling! You've grown up so much! Look at you!