Chuuya wides his eyes as he stiffens. What???

Chuuya: "I'm sorry, but can you repeat that???"

He asks Mori who's sitting in front of him. Mori had called Chuuya to his office and when Chuuya arrived he also sees Dazai there, standing next to Mori and holding a letter.

Dazai: "He said that the laboratory you were in sent us a letter, threatening the us to give you back to them."