Minikui Orc no Gyakushuu - Doujin Eroge no Kichiku Koutaishi ni Tensei Shita mo Otoko no Junan

Rui, an unpopular college student, wakes up to find that he has been reincarnated as Ludwig, the villainous protagonist of the brutal erotic doujin game "The Ugly Orc's Revenge." He looks ugly, just like an orc. If you follow the game's original story, you're sure to end up in disaster! In order to avoid the disaster route, he begins secret training. His appearance charms the heroines, and he becomes unexpectedly popular and faces chaos. He won't let them call him "Ugly Orc" anymore!