Erotic pleasure is so central to the Shinwa culture that one is considered uneducated if not well-versed in the Jin-Hakku, an ancient sexual reference. As a bonded triad, Kai, Joran and Hana have long enjoyed the carnal pleasures it describes.

However, infertility can be a death sentence and Hana has yet to conceive. Desperate, the men turn to an obscure volume of the Jin-Hakku. What they find is daunting—three nights of exquisite sexual “torture” that will test the limits of their stamina and self-control, but for Kai and Joran, failure is not an option.