Jiro has a problem. His grandfather has run off and left him in charge of an ancient Japanese bathhouse—one that caters to beautiful women!

More bad news: the bathhouse is falling apart, guests have disappeared, and, to top it all off, the business is bankrupt. Now it's up to Jiro to save the day: rebuild the bathhouse, please the guests, and restore the fallen establishment to its former glory.

But there's one more monster-sized problem: this is no ordinary bathhouse. The guests may be beautiful women, but, Jiro soon learns, they are also not entirely human ...