Yaiba: Samurai legend 1.

Upon enrolling in school, Yaiba quickly crosses swords with his soon-to-be rival, Onimaru. When Onimaru is transformed into a demon by the cursed power of Fujinken, the Wind God’s Sword, Yaiba embarks on a quest to Mount Tengu to find his own enchanted sword. But Yaiba lacks the skill and knowledge to use such a powerful weapon. If he can’t control himself, it will control him!