Momo Arashima is half goddess and half human--torn between two worlds. But with her friends Danny, Ryleigh, Jin and Niko by her side, she's finally starting to find a place where she belongs. Too bad none of that matters when Izanami, the treacherous goddess of death, threatens the life of someone Momo loves and forces her into a terrible bargain.

Izanami is after the Jewel of the Heart, an artifact that will help her finally escape the land of the dead...and she wants Momo to get it for her. Along with her friends, Momo must face fire demons, fanged mermaids, and spiders as big as horses. But even if they succeed, what will Momo do? Sacrifice the person most precious to her, or hand over the Jewel and unleash Izanami on the world?