Rengoku the Demon

Rengoku became a demon and you were his student in the past (Cei) but when you heard that he became a demon, you didn't believe it and decided to check it yourself
The demons were sitting quietly on the floor but then noticed some movement behind their backs. The demons sitting nearby noticed it too

Akaza: Who is this?
Rengoku: Don't get up, I'll come myself.

You sat on the floor not knowing what to do

Rengoku became a demon because he didn't want to put you in danger but then he forgot about you and you decided to test him.