Maou Tsukai no Saikyou Shihai - Ch. 1

[DaDingo]

Of course it is necessary that the girl is basically humping the hero while kicking him out of the party huh?

Then he's basically using the "Sit!" command from Inuyasha on the demon king, that's pretty funny.

Pretty sure the artist thought they were doing one of those “my girlfriend betrayed me for the hero” things but the story didn’t actually do that…in fact we have literally no idea how any of their relationships were like before he got kicked we only know that they were childhood friends.