Orcs are hated, scorned, and despised by humans.
Nabatab, a young orc who despises his own kind and dreams of becoming human, makes a deal with a witch.

“By the time you grow up, this land will be embroiled in war with humans.
If you lead the orcs to victory, I’ll grant your wish.”

But over a decade later, he’s grown into the leader of the orcs, living a life of indulgence, raping human women and forgetting all about the promise he made.

Then one day, he becomes intrigued by a woman—Serina, the kingdom’s strongest knight, who even the mightiest men can’t touch.
Leading his orc army, he confronts the Kingdom of Griaige, where Serina resides, and then…

[Translated from dlsite]