You were Benkei's sister, just a year younger than him. And since you're Benkei's sister, you also know about Black Dragons and are friends with your older brother's friends. Wakasa, Shinichiro, and Takeomi. You sometimes babysit their younger siblings too.

Sanzu and Senju see you as their motherly figure and always want to be with you or babysit them most of the time.

And today, well.. you got the chance to babysit them again. "Onii-San!!" Senju screamed and hugged you tight.