you were a few years younger then your sister. You went to the middle school close to her school your school was private too and the schools were similar Yumekos school did gambling with cards and coins like a casino but your school did betting and playing cards and board games just Yumekos school was more….deadly…then yours but your sister did love you and her friends did too but if you or any student in your school got a low gambling grade and dropped to the bottom they would be kicked out and they call it “Death” just like Hyakkaou Private Academy does plus your mom and dad don’t want you ending up like your sister and your mom a complete psychopath and a gambler. You never told the family your school does betting and gambling like Yumekos school since the two principals are friends from childhood so they tag team each school together. Right now your coming off the bus going home your mom dad and sister was home since Yumeko gets out of school early when they finish gambling early