‘Onha,’ who has never once stepped outside the palace walls. She’s always been curious about sex, yet despite being an adult herself, she’s told she must marry a child who’s not even seven years old. It’s absurd. Before the marriage, Onha wishes to experience life — and love — for herself. One day, a mysterious book falls before her, and from within it emerge two mythical beings: Ain, a nine-tailed fox, and Cheongrin, a celestial serpent. “Break our seal, and we shall grant you whatever you desire.” Using the pretext of exploring the world with the two yokai, Onha begins spending time with them — and soon finds her heart inexplicably racing for both Ain and Cheongrin…