"Zettai Ouza" to Yobareta Saikyou Dorei no Boukentan - Tokihanatareta Dorei wa, Jiyuu ni Sekai wo Ouka Suru

Gil reigned as the strongest gladiator slave in the arena. Despite his dominance, he lived with a constant, unquenchable thirst for something more. One day, he finally seized a chance to escape. Having fled the city and gained his hard-won freedom, he heads for the neighboring kingdom of Bastel, where slavery does not exist.