Taishou Ayakashi Keiyaku Kunagai: Teito Mononoke Yashiki to Inou no Hanayome

The story is set during the Taisho era. The main character is Shino, a young woman with the ability to see "ayakashi" (supernatural beings), who, after the death of her parents, lives in mistreatment at her relatives' home. While attending a party as a background guest, she is unexpectedly proposed to by Tachibana Sakura-tora, the young heir of a prestigious flower clan, thus beginning a fantastical love story.