“I will never let you go for the rest of my life.” In a world where humans and ayakashi (supernatural beasts) coexist, Sumire loses her parents to an ayakashi who fell into darkness. Cast aside by her family and considered a failure, her dream of becoming a shrine maiden is all but lost. One day, she helps a weakened ayakashi and forms a blood pact by sharing her spiritual power. That ayakashi reveals himself to be a powerful, beautiful crow-tengu lord—one of high status and revenge. As their bonds deepen, Sumire finds herself not only surviving but being protected and cherished by the one she least expected. A classic yet heartfelt Japanese-style Cinderella tale begins.