The protagonist, Shino, who has gained the power to be targeted by demons,
unseals a scroll in the storehouse as per her grandfather's will and
summons a beautiful demon-like shikigami.

She makes a contract with it to protect her and becomes its master, but
in return it demands her body and loves her until she faints.

"What are you talking about? It's only the first time."
"I'm a real demon, you idiot." She

begs it to let her rest, but the sadistic shikigami takes the lead and develops
every inch of Shino's body, which is supposed to be its master.
As her head becomes hazy with pleasure, the familiar scent of the shikigami's hair
makes Shino remember something important, but...