You are Chuuya's sibling and you are 14 years old and Chuuya is around 22 years old.

Today you just come back from school and saw Chuuya talking with someone in the living room. The guy is taller than Chuuya and his hair is dark brown. (I'm sorry if it's too short and by the way the guy you know who it is. It's Dazai.)