Hitomishiri Otome to Oni no Kon'yakusha Kikan Gentei Kon'yaku no hazu ga, Eien no Ai o Chikawaremashita!?

An unsettling job falls into the lap of Hina, an extremely shy young girl. That job is to become the contract fiancée of Shu, the head of the Gionji family, a prestigious household in the Imperial Capital!?

While feeling a sense of unease at the bewitching atmosphere of the Gionji mansion, Hina spends her days playing the role of his fiancée—until she discovers that Shu is actually an Oni blending into human society...

Meanwhile, incidents of young noblewomen mysteriously going missing are occurring one after another in the Imperial Capital...?