A fantasy story based on Japanese mythology about sisters who are pearl divers and a dangerous deal with the gods in exchange for life. Kai and Kishi are twin sisters, their main talent is to get pearls from the seabed. One day, the usually obedient Kishi suddenly breaks the rules of the hunt and becomes the prey of the Ghost Whale - bake-kujira. Kai is ready to do anything to bring her sister back to life, but this is beyond the power of an ordinary mortal... She will have to make a deal with the gods: in exchange for the soul of her sister Kai you need to steal a magic pearl from the powerful nine-tailed fox. And, stepping on this path, Kai must risk everything that is so dear to her. Published in Russian for the first time.