The heroine's reaction when the demon king appeared is so suspicious. Everyone was scared, terrified or something but she's blushing??? What kind of reaction is that, I mean, he's good looking yeah, but the normal reaction if someone is to appear so suddenly in thin air is to be scared, and that someone is the demon lord y'know. Definitely suspicious.
Anyway, nice chapter. The demon king who is mostly emotionless has started to show emotions!?!? And what's more, he somehow opened a door to a new world LOL. This seems fun.