The Main Heroines are Trying to Kill Me

To save the hopeless Dark Fantasy World, I held back my tears and destroyed the world, then killed the Demon King and returned. Now, I’m trying to save the world using the “System” I gained as the “Regressor’s Privilege”… But the Main Heroines have also awakened their own memories of the previous timeline. God damn it. -Yandere- (Mtl)