Twin sisters Ai and Mai Amatsu, trained from childhood in their family's ancient spiritual rites, find their skills suddenly put to the test when strange creatures emerge from another realm. Their grandmother Genshu reveals the twins' destined duty to protect the descendant of a revered god, a young man whose presence brings fresh complications to their already demanding role. As the sisters confront the first stirrings of an old family conflict, they must balance their priestess responsibilities with the unexpected demands of guardianship.
