I'm a Hero, but the Heroines are Trying to Kill Me

To save the doomed Dark Fantasy World, I gritted my teeth, destroyed the world, and defeated the Demon King, only to start over. Now, armed with the "System" granted as my "Regressor's Privilege," I'm determined to save the world again. But the main heroines... They've also regained their memories from the previous timeline. Damn it all.