This mostly follows the plot of the first one except a little differently. (Also I changed dazai in this bc I was sick of how he acted in the other ones)
As a teenager, you’d joined the Port Mafia under the circumstances that they’d give you protection and help you figure out your ability. What you ended up becoming was an executive and assassin. You partnered with Dazai and Chuuya a lot. You got used to the arguing and fighting.