‘Onha’ has never once stepped foot outside the palace.
Though she’s always been curious about matters of sex, she’s baffled when told that, as an adult woman, she must marry a child who’s not even seven years old.

Just before the marriage, as Onha longs to experience more of the world,
a mysterious book suddenly falls before her.
From within it emerge two beings — Ain, a nine-tailed fox, and Cheongrin, a celestial serpent.

“Release our seal, and we shall grant you whatever you desire.”

Under the excuse of seeing the world, Onha begins spending time—almost like dating—
with these two mystical beings, and soon finds her heart fluttering for reasons she can’t quite name…