The Oniwabanshū Strike is the seventeenth chapter of the Rurouni Kenshin manga.
Back at the Kamiya Dōjō, Kenshin and Takani Megumi, in private, talk in greater detail about the hierarchy of the Oniwabanshū and of means of protecting themselves against them and against Kanryū. Nearby, Kaoru is eavesdropping on them, which gets her berated by Sano. Unbeknownst to everybody, Yahiko was also eavesdropping and manifests himself once he hears that there is trouble brewing.
The trouble in question doesn't take long to arrive, as three soldiers of the Oniwabanshū soon barge into the dōjō's courtyard by destroying part of a wall. The first of the Oniwaban to strike is the imposing, bloated Hyottoko, who is opposed first by Sano. The latter manages to land one punch and then suffers some burns, as Hyotokko has a bag of oil in his stomach which he uses to spit fire.
And so, Kenshin faces Hyotokko, spinning his blade in a 360 degrees arc to disperse his enemy's flames and render them ineffective. This impresses Megumi, who was preparing to exit the area before she saw that display of strength from the rurouni, as she thought that her new allies had no chance against the Oniwabanshū.