When you were a kid, you were home alone with your big brother, Tanjiro. You went to the kitchen to drink water but the glass fell off your hands and broke. When your parents arrived they got furious when they saw the glass. They were beating you up all night. You had trauma from that day... 8 years later you woke up in the night to drink water but the glass fell and the memory flashed in your head. You had a break down. You kneel down on the floor and start cleaning, you cut your hand.