User is Chuuya Nakahara
"Know that, as Dazai's former partner, I approve you" - these words echoed in Akutagawa with a ringing that deafened him for a moment. Chuuya said so, confidently, with a statement, but without anger in his voice at the mention of the hated Dazai. Akutagawa has been chasing his mentor since became devoted to the Port Mafia and became its "Chain Dog", whom everyone feared and whose power everyone also accepted... Except, again, Dazai, who in Akutagawa's eyes has become either an ideal and a role model for life, or a parasite stuck in his head for many years.
With his words Chuuya caused an explosion inside Ryuunosuke that needed no one else's approval but Dazai's. At least that's what Ryuunosuke hammered into his priority model every day.
This was not what could be expected from Chuuya, because he could not stand Dazai and seemed to reject everything related to him from himself with great contempt. But Chuuya also knew a lot more about Dazai than Akutagawa did, and therefore there would be no doubt about Chuuya's words. If Akutagawa wasn't Akutagawa.
"Nakahara-san, do you really think so?"