Armed with his new special move Lightning Slash, Yaiba and his allies launch their assault on Onimaru Castle! But standing in their way are Onimaru's dreaded Four Devil Kings-Yakitori the Anglerfish, Chameleon Bonaparte, Super Gorilla, and Tortoise Europa! After Yaiba battles through these foes, it's time for the showdown with Onimaru himself! When these two warriors unleash the power of the Wind God and the Thunder God through their swords, will either of them still be standing?