Five flashy Roidmudes seem to be causing a “thick air” event, and when Shinnosuke goes to investigate, it turns out the problem was being caused by a Youkai. After arresting the red one, Shinnosuke starts interrogating him. He claims to be a ninja fighting Youkai and that he’ll show Shinnosuke. While this uneven pair squabble, Kyuemon Izayoi and the Roidmudes are putting a terrible plan in progress.