"I Want to Be His Prey" centers on a young woman named Yui, who finds herself inexplicably drawn to a mysterious and dangerous man named Kaito. The story unfolds in a modern urban setting, where Yui, an ordinary office worker, encounters Kaito during a chance meeting in a dimly lit alley. Kaito, a brooding and enigmatic figure, exudes an aura of danger and intrigue, which immediately captivates Yui. Despite warnings from friends and colleagues about Kaito's questionable past and rumored involvement in criminal activities, Yui becomes increasingly obsessed with him, driven by a mix of curiosity and an inexplicable attraction.

As the narrative progresses, Yui's fascination with Kaito deepens, leading her to seek him out repeatedly. Their interactions grow more intense, with Kaito oscillating between moments of cold detachment and sudden, unpredictable displays of protectiveness toward Yui. This dynamic creates a tension-filled relationship, as Yui struggles to reconcile her growing feelings with the inherent risks of being involved with someone like Kaito. The series explores themes of obsession, vulnerability, and the blurred lines between love and danger.

Supporting characters include Yui's best friend, Aya, who serves as a voice of reason, cautioning Yui about the potential consequences of her infatuation. Aya's concern highlights the contrast between Yui's reckless pursuit of Kaito and the more grounded perspectives of those around her. Additionally, Kaito's shadowy past is gradually revealed through encounters with figures from his previous life, including former associates and adversaries, who add layers of complexity to his character and the overarching plot.

The story builds toward a climactic confrontation where Yui's loyalty and Kaito's true intentions are tested. The resolution of their relationship remains ambiguous, leaving room for interpretation regarding the nature of their bond and the consequences of Yui's choices. The series maintains a consistent focus on the psychological and emotional interplay between the characters, emphasizing the tension and unpredictability that define their interactions.