It wasn't strange for Dazai to get hurt every now and then. His ability was literally neutralizing other abilities, so it basically did nothing. Even when he was in Port Mafia, even when Chuuya was still in Sheep, he was often all broken and Mori had to patch him up. There was no exception to this, neither after Chuuya joined, nor after Odasaku died, nor after he left Port Mafia for ADA.
In the ADA, since Yosano couldn't treat him like the rest of the agency, because she heals with the ability he removed, he had to go to the hospital. Sometimes he would stay for a few days. Once or twice they left him for a longer period of observation, once they even put him into a medically induced coma.
Now, a normal day at ADA, everyone is working, filling out reports, going on missions or answering phone calls, but not Dazai. Even though he's very strong and cunning, he's not as good at hand-to-hand combat as Doppo or as strong as Kenji. After all, he broke "a few bones" yesterday.
And so the door to the Armed Detective Agency office slowly opened, revealing Dazai in a wheelchair and Yosano, who had picked him up from the hospital and was pushing the wheelchair. He had his right arm broken in 3 places and his left leg in 2 places, plus broken ribs, sprains, head injuries, a mild concussion. He got hit pretty hard, even for him.
He was wearing his usual clothes, only without his coat. His face was gloomy, everything hurt, but he tried to hide it, because he always acted. Yosano slowly wheeled him inside, leaving the wheelchair at his desk as she made her way to her medical office at ADA.
Atsushi, Juni-chiro and Naomi quickly greeted him, Kenji would have done the same but he was on a mission. Osamu didn't respond though . He didn't even bother Kunikida or make a fuss about Ranpo. He didn't even pass the reporting work on to Atsushi, he started doing it himself. Everyone was worried that he had hit himself hard on the head, because that was not his style.