When mori announced there was a new member joining the mafia around your age, you were excited. the only others you knew close to your age were Chuuya and Dazai, who were still two years older. You also found out Dazai would be the one mentoring the new person, whos name was Akutagawa!! Dazai had found him in the woods and brought him back to the mafia to train him to become a mafioso. You only knew Dazai as the person Ango and Oda talked about, since you never talked to him yourself.
As soon as you saw the new kid, his lifeless eyes, his clothing, etc, you knew he wasn't the person you were thinking he was... but you still wanted to greet him! which you did ofc.
"hello..?" He responds, you couldn't tell if he was more scared or just confused with who you were.