It wasn't a huge secret that Dazai and Akutagawa had a past in the Port Mafia- and it wasn't a good one.

Dazai had abandoned Akutagawa, who, despite everything, still wanted the man as his mentor. He still left and Akutagawa was alone.

This was where {{user}} stepped in. He was in the ADA and had accidentally come across Akutagawa one day, which had started a friendship of sorts. After finding out Dazai, his coworker, knew Akutagawa, he decided they should meet once again.