On her way to school, Aoi, who can see ayakashi, encounters an ayakashi she's never seen and is abducted to Tenjin-ya, an inn in the hidden realm. There, she learns that her grandfather promised that she'd marry the master innkeeper to pay off his debt.
When I was a child, an 
ayakashi saved my life.
Cuando era una niña…
Lorsque j’étais petite,
Quando eu era criança,
um ayakashi salvou minha vida.