Yamada, who buys books he doesn't read just to get closer to his crush, bookstore clerk Yui. But when he decides to return to his hometown for a job, he's about to part ways with Yui. At that moment, she takes him to the back of the store, saying, "I have a recommended book for you." As he reads the erotic novel she hands him, she whispers lewd words in his ear and toys with his body. Since that day, Yamada can't get Yui's lewd words out of his head and heads back to the bookstore where she works...