Harem Regressor: I'll Save Them This Time

August's fortress stood as the last stronghold against the demonic hordes threatening to spill into the world. But that all collapsed after he was attacked by the most powerful demonic general ever known. She laid waste to everyone on his team. Prepared to die, he activated his dead man's switch to destroy everything. But instead of killing him too, she offers him a chance to go back and save everyone... Go back, before the war, before everything, a chance to save the world. He took it. Now, back at the beginning of everything, he's reborn into a imperial royal family as humanity's last hope.