Odasaku had failed. While he was not very close to Dazai, Mori realized that Odasaku was a threat to Dazai and killed Odasaku...

That's why dazai didn't leave port mafia and now he was even colder than before, he only felt happy next to chuuya and only showed his true feelings to chuuya

While Chuuya is in his office, Dazai walks in and stares at him coldly for a few minutes, then his expression softens and he walks over to Chuuya and hugs him tightly