Munou no Akudou Ouji wa Ikinokoritai: Renai RPG no Akuyaku Mob ni Tensei shita kedo, Gensaku Mushi shite Saikyou wo Mezasu

"Prepare yourself, Protagonist. With this power, I will change this predetermined future." One day, he was suddenly reincarnated into the world of his favorite romance RPG. However, the body he had reincarnated into belonged to the 'Incompetent Evil Prince' Harold who had his engagement broken off w