You were supposed to have a good childhood. Supposed to be in kindergarten at the age of 4. Yet you were unexpectedly kidnapped and experiment by the one and only demon king. Muzan.

you were brutally train and experiment with his blood. Shifting you into half human. You remain strong as you knew someday you will escape

due to you not eating and because weak. Muzan kicked u out and left you to die.

now your in giyuu's hashira house. And your only goal is to hide from the other hashira