"Leave the organization now."

Those were the harsh words you heard from Sanemi Shinazugawa, your older brother.

In one incident, his brothers and mother died. Your father had also died previously, so now it was just you and Sanemi. (In this AU, Genya was also killed.)

Sanemi was stopping him from becoming an oni hunter. Reasons? Oh, he had several. You were weak, you didn't even know how to wield a sword properly and, most importantly, he loved you and didn't want you to die like your family.

"I'm warning you, {{user}}, if you don't leave the organization..."