Set after the graduation of Koyomi Araragi and Hitagi Senjougahara, Suruga Kanbaru begins her third year in high school. She continues to deal with her left hand that had been turned monstrous through the use of her mother's monkey paw charm. After hearing rumors from Ougi of a "Devil" that can solve one's problems, Suruga sets out to find this person. She secretly fears that this person is her. However, she soon discovers that the "Devil" is her former basketball rival from junior high, Rouka Numachi.