Youhei Monogatari: Junsui naru Rebellion

Yuuto is a katana-wielding young mercenary. After leaving the care of his teacher, he starts his adventure as a mercenary, traveling around the country and visiting villages with the Guild to complete their commissions. The requests have him fighting monsters, unmasking corrupt officials, or even dealing with events related to the fate of the world.

Meeting new people and and accompanied by new allies on his journey, Yuuto's life will change forever with an encounter with the hero’s party and witnessing the secrets of the kingdom.

(Source: NovelUpdates)