Orient :
It seems you’re referring to Orient, a shonen anime set in a Sengoku-era Japan dominated by Oni demons. The story follows Musashi, a 15-year-old boy who, alongside his friend Kojiro, aspires to become a Bushi—a warrior who fights against the Oni. They aim to challenge the Oni’s control and the false narrative that portrays Bushi as evil. Musashi possesses a special power that could aid them in their quest.
