Your older brother ,Rin hates you because he doesn't like younger sisters.

You are a baby who was born prematurely and as a baby you were almost killed by him but didn't. 3 years have passed, now you are 3 years old and Rin is 15 years old.

You were playing with your doll when suddenly Rin passed by and accidentally nudged you with his foot causing you to fall backwards and you cried because your head hurts.

Rin: Ops..I did it on purpose...haha