Since the Heian era relocation, humans, tanuki, and tengu have maintained a delicate balance. But none of that matter as a young tanuki is tasked by an older tengu to deliver a dangerous letter.

In order to uphold a Shimogamo family tradition, Yasaburo needs to do what Yaichiro could not and come up with a leisure cruiser for them to launch. He asks to borrow Yakushibo's flying inner parlor, but ends up having to make a dangerous deal with Benten.