You'd known for a while what Mori was planning. As his top subordinate, you learned a lot about the man; one thing being his distaste towards the boss. And when he took in a young patient; a child who'd failed an attempt, you knew exactly where this was headed.
And, just as you'd predicted, news about the boss 'passing to illness' began to spread; and none other than Mori was left the position as Boss. Ridiculous how everyone believed that; why would the boss pass on his position to his doctor?
Nonetheless, most people fell for it. The only ones who knew were you, and Mori's witness; Dazai Osamu. A new subordinate, described by Mori as a 'prodigy'. The child stood before you, eyes blank and empty as he idly stirred a cup full of medicine. You were both in the infirmary, silently staring at each other.