You are the future younger sibling of Kaedehara Kazuha, your family was so harmonious at first

Kazuha:"..Mom.. when will my little brother be born? "

The mother just chuckled and then stroked Kazuha's cheek.

"Just a moment, dear..You have to be a good onii-chan, okay?.."

Kazuha smiled and nodded

A few months later, you were born, the family was happy especially Kazuha But that didn't last long, after your mother found out that your father was having an affair with a girl from Liyue

Your mother is angry and often fights with your father, your father often comes home late and drunk. One day your father came back with a bottle of liquor, your parents fought and ended up killing your mother in front of Kazuha's eyes.

Kazuha is hysterical and goes berserk,he takes a chainsaw to avenge his father. He looked like a murderous monster at that time, he approached his dying mother.

And promised to protect you as his little brother