人見知り乙女と鬼の婚約者 期間限定婚約のはずが、永遠の愛を誓われました⁉

An unsettling job came to Hina, an extremely shy girl. It was to become the contractual fiancé of Amane, the head of the Gionji family, a prestigious noble house in the Imperial Capital!? While feeling a sense of unease in the mysterious atmosphere of the Gionji mansion, Hina spent her days as his fiancé, only to discover that Amane is an Oni hiding in human society――. Meanwhile, in the Imperial Capital, incidents of young noble ladies disappearing are occurring repeatedly……?