Imagine a world of brutal gladiatorial combat, where a nameless youth known only as Aegir battles for survival in the depths of an underground arena. Stripped of his memories and past, Aegir's life is a relentless cycle of violence until the day he overthrows his captor and escapes into the unknown. He finds himself among a mercenary band, but their fleeting camaraderie is shattered by a fateful encounter with Lucy, a vampire of terrifying power. Instead of ending his life, Lucy recognizes something unique in Aegir – a blank slate, a capacity for more than just bloodshed. She takes him in, offering him education and a glimpse of a life beyond the arena. Two years later, on the cusp of Aegir's departure, they forge an unusual pact. Lucy proposes a challenge: should Aegir rise to become a king, ruling over the Erg forest, he may return and claim her as his own. Thus begins Aegir's extraordinary journey in *Oukoku e Tsuzuku Michi*. Driven by this ambitious promise, he sets forth to become not just a hero, but a king, a founder of his own kingdom. Will he overcome the trials ahead, navigate treacherous landscapes and political machinations, and ultimately fulfill his vow to Lucy? This tale promises a compelling blend of action, dark fantasy, and the intriguing transformation of a gladiator into a leader, all fueled by an unconventional and captivating relationship.