Lina was originally a down-and-out low-level witch, but in a series of bizarre commissions, she gets acquainted with a noble girl, a vampire progenitor, and the legendary grand witch. When demons return from the depths of dreams, the peaceful town falls into crisis one after another. In order to protect her students and friends, she has no choice but to pick up her staff and embark on a journey to uncover the truth of her past-life identity and the world's catastrophe.