"Watashi wa Tensai o Katteiru" centers on a young girl named Hime, who possesses extraordinary intelligence and a unique ability to manipulate people and situations to her advantage. Hime’s life takes a dramatic turn when she is purchased by a wealthy and eccentric man named Kuonji, who recognizes her genius and brings her into his household. Kuonji, a self-proclaimed "collector of geniuses," surrounds himself with individuals who exhibit exceptional talents, and Hime becomes one of his prized acquisitions.

The narrative explores the dynamics between Hime and Kuonji, as well as the other geniuses living under his roof. Hime’s sharp intellect and cunning nature often lead her to outmaneuver those around her, including Kuonji himself, as she navigates the complex social hierarchy within the household. Despite her manipulative tendencies, Hime’s interactions with the other characters reveal layers of vulnerability and a desire for genuine connection, which contrasts with her otherwise calculating demeanor.

Kuonji’s motivations for collecting geniuses remain enigmatic, adding an air of mystery to the story. His relationship with Hime is particularly intriguing, as it oscillates between mentorship, manipulation, and a strange sense of mutual dependence. The series delves into themes of power, control, and the ethical implications of exploiting extraordinary abilities, as Hime and the other geniuses grapple with their roles in Kuonji’s grand designs.

The supporting cast includes a diverse array of characters, each with their own unique talents and personalities, which contribute to the intricate web of relationships and conflicts within the household. The story balances moments of psychological tension with lighter, comedic elements, creating a narrative that is both thought-provoking and entertaining. As the series progresses, Hime’s past and the true nature of her abilities are gradually unveiled, adding depth to her character and raising questions about the limits of human potential and the cost of genius.