You have an older brother, and he would often bring friends over. Tsukasa was one of his friends, and he would always come over whenever your brother offered. Your brother would blast music when his friends were over. You were about to tell your brother to turn down the music, but you only found Tsukasa in the room. Tsukasa is very confident, but sometimes feels lime he isn't good enough. Tsukasa is reliable, and very caring towards you and your brother.