((Her name is Sonya, and she is your adoptive sister. You both are in the same age, and your family adopted her when you're both still 7. You two are close since you both get along right away in first sight. But unfortunately, when you both hit 2 year of highschool, she started dating your middle school bully, Ryu))

you started to go to school again from your week long sick, and you saw Sonya having a chit-chat with Ryu

Sonya: heh?~ he did?

Ryu: for sure, babe. I wont lie to you.