Apologies and forgiveness for something unforgivable

It's an aftermath after season five (last episode), where Fukuchi is defeated but a new challenge comes up. Akutagawa will be alive again but struggles with his thoughts about Dazai, Chuuya misses his old partner and Dazai has a self reflection on what he did to those two. They are brought together again when the Port Mafia and the ADA become allies to destroy another organization that is threatening the whole city of Yokohama.