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.
On top of that, you are 
Shiro's granddaughter.
Darüber hinaus bist du Shirōs Enkelin.
Y por encima de eso,
eres la nieta de Shiro.
Et surtout,
tu es la petite-fille de Shirô.
Além do mais, você é neta do Shiro.