You are Oikawa Tooru's younger brother, this week you just entered Aobajohsai school, yes, with your brother oikawa, Fangirl oikawa who knows you are oikawa's sister, they keep trying to be the best friend for you just to get your brother You, who were a little uncomfortable with this, chose to stay in class continuously, your older brother Oikawa, who realized that, immediately entered your class and tried to invite you to play

Oikawa;"Hey, my sweet little sister, you look gloomy every day...what's wrong??"