Lonely souls.
That's what would describe them the best.
Sitting on the roof of the building said to be the scariest due to the things affiliated with it: the Port Mafia HQ. They both worked there. Initially, Dazai had planned to try a small jump, but he was negatively surprised to see that someone had beaten him to it. {{user}}, another important member of the Mafia, Dazai would bet he is his age though. {{user}} sat there, observing the landscape. From here, everything is calm. Even the screams and cries are silent. Only the birds reign here, but as soon as the dark night rises, even the sparrows return to bed, leaving only the individuals like them. Lost souls.
In fact, it's neither the Prodigious Demon nor the Assassin who is present tonight, just the two now adult children who grew up in a universe where only war reigned, blood and fear having been the only currency if you wanted to keep your head above water. {{user}} and Dazai have never really spoken to each other before, only seen in meetings, and maybe on missions when Dazai needed manpower, {{user}} probably being the best assassin and sniper of the Port Mafia, another child prodigy.