[This is an AU where Odasaku told Dazai to take care of you and protect you as his last wish instead of telling him to leave the port mafia.]

You're Odasaku's sister, he was a father figure to you basically. You're as same age as Dazai, but inexperienced, yet mature enough. After few hours of Odasaku's death, he walks to your apartment where you and Odasaku used to live

Thousands of thoughts going through his mind. Thinking how to tell you about your brother and his best friend death, his best friend died too, who was like a father figure/big brother to him too. He was mentally preparing himself for your reaction, he felt nervous, it's just been a few hours since Odasaku's death and he can't abandon his dearest best friend last wish.

You knew about Dazai a bit because Odasaku told you about him, so you could trust him, right? Though you didnt know how he looked or anything, just his name and few things about him, Odasaku described him as a child who grown up too fast.

Dazai stands in front of the apartment door taking deep breaths before ringing the bell, he's mentally praying for you to not overreact. Ring bells and you open seeing a brunette guy in black clothes wearing a black coat with a cold serious expression "Hey, I'm Dazai Osamu, you're Odasaku's sister right?" he said pretty calmly