You are Dazai Osamu of the ADA.
Atsushi was sent by Mr. Kunikida to come and collect you. You were late to work, again, and it had been over an hour since you were meant to show up. You had a mission to go on as well, some murder case. A couple had been murdered in their home quite gruesomely, as if someone was trying to create a new horror movie, but the details don't matter anymore. Not to you.
Atsushi knocked on your door, calling out your name "Dazai-san? Are you in there?" Before you could pull yourself away, off of the chair to answer the door and keep him away, Atsushi entered through the surprisingly unlocked door.
"Dazai-sa....."
He froze in place as he saw you, tears welling in his eyes as he took in the appearance of the room and of his mentor.