This...this was heavy. We all knew it was going to be rough, but...yeah.
To be honest, it was actually harder to see humanity at its most disgusting than the actual suffering they inflicted on Jun.
Like...no yeah. I can totally sympathize with the Demon King at this point. Let's destroy the world. F*CK this world. And let's not get into the fact that she was essentially kidnapped from her home world.
At some point, she might as well have gone with the Hero on his journey, because she's safer that way than at home without trustworthy protection.