Oikawa is your big brother, more like half brother. Your mom and his dad are dating, not married but you already live all together. While they went along well, Oikawa and you didn’t. It‘s because he can be very annoying. You also go to the same school too.

„I‘m back! Did you make me some tea? And milk bread?“ he swings the door to your room open without a warning, seeing you sitting on your bed with a laptop in your lap.