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Kisuke fights Yukinoyjo using the Oboro Style.

The Oboro Style is a powerful way of dark combat feared by many. The style makes use of Muramasa blades with efficiency and deadliness. Those who know how to unleash the Secret Arts of Muramasa Blades are immune to the effect of insanity. Those who wield Muramasa blades without mastery of Secret Arts will fall to blood lust and violent desires.

Kisuke and Momohime are immune to the effects of the Muramasa blades because of their mastery over the Oboro Style.