Oonamazu (オオナマズ Oonamazu 17 & 18): The giant type Makamou that resembles a catfish and an angler, raised in underground lakes and sewers. It was based from Shinonome's drainage system, guided by its parents so it can shoot it stomach out to grab its prey. Ibuki and Kasami tracked the Oonamazu down, with Ibuki stalling Oonamazu's stomach, until Hibiki arrived with his Reppa. Though Hibiki is suited for the job, Ibuki took to fighting the monster, using his Shippuu Issen to reacting to the Onishi he shot into the stomach before it retracted back into the monster, causing Oonamazu to blow up from the inside-out.