"Witch Watch" centers on the life of Nico Wakatsuki, a young witch-in-training, and her childhood friend, Keigo Morihito, a half-oni (demon) tasked with protecting her. The story unfolds in a modern world where supernatural beings coexist with humans, blending everyday life with magical elements. Nico, despite her witch heritage, struggles with basic spells and often finds herself in comedic and chaotic situations. Keigo, on the other hand, is a loyal and overprotective guardian who uses his oni strength to shield Nico from harm, though his efforts frequently lead to unintended consequences.

The narrative explores their daily lives as they navigate school, friendships, and the challenges of their supernatural identities. Nico’s magical mishaps often serve as the catalyst for episodic adventures, ranging from dealing with mischievous spirits to uncovering hidden magical artifacts. Keigo’s unwavering dedication to Nico is a recurring theme, though his overbearing nature sometimes creates tension between them. The dynamic between the two protagonists is balanced by a supporting cast of quirky characters, including fellow witches, demons, and humans who add depth and variety to the story.

As the series progresses, deeper layers of the world’s magical lore are revealed, including the history of witches and oni, as well as the responsibilities tied to their powers. The plot occasionally delves into more serious themes, such as the consequences of misusing magic and the importance of trust and cooperation. However, the tone remains lighthearted overall, with humor and slapstick comedy playing a significant role in the storytelling. The interplay between Nico’s determination to improve as a witch and Keigo’s protective instincts drives much of the narrative, creating a blend of action, comedy, and heartfelt moments.