At home, Momo Arashima cares for her mother; while at school, her classmates tease her for mixing up reality with the magical stories her mother used to tell her. But when a terrifying death hag attacks Momo, she realises the stories are true - Momo's mum is a Shinto goddess who used to protect the gate to Yomi, the land of the dead. Now that passageway is under attack, and countless evil spirits threaten to escape and destroy humanity. Momo - joined by a talking fox called Niko, and her former best friend, Danny - is the only one who can stop them. Can Momo embrace her identity as half-human, half-goddess to unlock her powers, force the demons back to Yomi - and save the world?