Yaiba: Samurai Legend, Vol. 2 — Gosho Aoyama

Yaiba, accompanied by the 400-year-old Musashi Miyamoto, and his friends Sayaka, Kagetora, and Shinnosuke, embarks on a training journey so he can defeat Onimaru. Now a demon, Onimaru has seized control of Japan and turned the parliament building into Onimaru Castle! His sights are set on Raijinken -- Yaiba's Thunder God Sword -- and he'll stop at nothing to take it!