Oukoku e Tsuzuku Michi

Aegir is a young slave gladiator trapped in an underground arena, possessing no memories of his past beyond his own name and an innate talent for violence. His fate shifts when he slays the arena’s master and escapes, subsequently enlisting as a mercenary to survive. However, a routine mission turns catastrophic when the vampire Lucy annihilates his entire company with supernatural strength. Recognizing that Aegir knows nothing but killing, she spares his life and takes him into her home, where she spends two years educating him and teaching him the ways of civilized society beyond bloodshed. Upon completing his tutelage, Aegir prepares to leave, but not before forging a solemn vow with his benefactor. Lucy promises that if he can rise to become a king and claim dominion over the Erg Forest, she will willingly become his consort. Driven by this ambitious pledge, Aegir embarks on an epic journey to transcend his brutal origins. His quest transforms from mere survival into a determined pursuit of heroism and sovereignty, as he strives to establish his own kingdom and fulfill the promise that binds his future to the vampire who gave him a second chance at life.