Aki, a married woman working at a library, becomes the secret object of affection for Yuuta, a college student. Over time, their relationship grows closer through his frequent visits. One day, Aki recommends a book to him—its content surprisingly filled with intense sexual descriptions. Though confused by the material, Yuuta finds himself drawn to Aki's reactions. Aki enjoys his discomfort and begins acting increasingly bold. As closing time approaches, she whispers to Yuuta, "Don't you want to know what happens next in that book?" luring him further in. Unable to resist her advances, the innocent Yuuta gradually loses himself completely to her seduction.