Bungo Stray Dogs (Season 3)

After the three-way organizational conflict ends, government bureaucrat Ango Sakaguchi remembers something that happened years before, following the demise of the old boss of the Port Mafia.

At the time, Osamu Dazai was still a recent recruit and assigned to look into stories about an unexplained explosion that had destroyed a portion of the city years prior, as well as its possible connection to the old boss’s purported reappearance.