Apprentice to Tenzen, Chikuma Koshirou (筑摩 小四郎 "Chikuma Koshirō")'s technique enables him to create miniature whirlwinds with his breath which suck his enemies in and then shreds them to pieces. He also wields a pair of kama hand scythes, which he can use in close combat or throw like boomerangs. After Gennosuke learned of the Hattori Truce's absolvement, Tenzen sent Koshirou to eliminate him. However, when Oboro attempted to stop the fight, Gennosuke used his Dojutsu to turn Koshirou's whirlwind back onto himself and completely destroy Koshirou's eyes. Gradually, Koshirou learns to use his other senses to compensate but still requires some sort of assistance to effectively fight.