Nayu is a witch so powerful that she is called a once-in-ten-thousand-years genius. Her legendary magical ability has allowed her to coast through life on arrogance and mischief, with every transgression forgiven because of her talent. That all comes to a sudden end when her magic runs out completely. With no mana left, the consequences of her past actions begin to hit her like a boomerang, and she finds herself helpless and alone. Desperate for help, she turns to the one person who has always genuinely cared for her: Komugi, a former student who has harbored a deep affection for her. Komugi agrees to take her in, and the two begin an awkward but tender cohabitation.

The setting is a modern world where witches and magic exist discreetly alongside ordinary life. Nayu, now stripped of her powers, must navigate everyday struggles she once dismissed as beneath her. Komugi, a kind and patient young man, becomes her anchor, though his unwavering devotion often embarrasses and confuses her. As Nayu searches for a way to restore her magic, she begins to experience unfamiliar emotions—jealousy, longing, and affection—that her genius mind never had to process before. A love rival appears, stirring possessive feelings she cannot name. Each step toward recovering her power also brings her closer to understanding what it means to care for someone else.

The story unfolds through a series of comedic and heartfelt episodes. Nayu’s attempts to get closer to Komugi grow increasingly bold, and her desperation to be near him fuels a chaotic but genuine romance. Eventually, Nayu does recover her full magical ability, but the victory is short-lived: a global crisis threatens to drain all magic from the world. Drawing on the empathy and human connections she has built during her powerless days, Nayu must use her regained power in a new way—not for selfish pride, but to protect the people she loves. The final arc resolves with her embracing both her magic and her feelings, leading to a conclusion where love and understanding prove as powerful as any spell.