It's a reverse isekai manga where both the princess and the demon army jumped to the hero's world. The would-be-hero gets protected by the demon king's daughter and army from a psychopath princess that wants to kill the hero so that he may get summoned/reincarnated to the other world. Some friends of the hero awakened to their job classes. And the hero slowly awakens to his powers in his world. Well that's all i remember from it.
It's licensed by Kodansha Comics so you can find it on places like Bookwalker under "Goodbye! I'm Being Reincarnated"