Having vanquished demons and halted invasions of devious creatures from the Spirit Realms, Asako Sekken and Agasha no Isao Ryotora are finally going to be married. But when a note from their old ally Sayashi arrives unexpectedly, the samurai find themselves dragged into another supernatural mystery.

Their investigation leads them to Crane lands and an ancient market ruled by a mysterious being. Now Sekken and Ryotora must use all their wit and charm to save Sayashi from a hundred year bargain before they find themselves embroiled in a conflict with a forgotten deity of unimaginable power.