In a world where humans and demons coexist, the zombie Shurika enrolls in a boarding school to learn how to hunt the common threat known as the "Fierce Beast". When a mermaid asks Shurika, "Weren't you a witch before?", she begins to ponder who she really is. While she has doubts about Marie, who seems to know something, feelings of affection for her also start to blossom. Amidst this, the two are summoned by the 'Witch of Desire'...