Kidou Kaimaru serves as an assistant professor at Genjōsai University, merging psychology, computer science, and parapsychology to dissect supernatural occurrences through empirical analysis. Partnering with Rem Ayanokōji, he supplies technological solutions and logical frameworks to demystify paranormal events, offering a counterpoint to Enkō’s mystical methodologies. Subtle romantic tension with Rem fuels a competitive streak toward Enkō, though their rivalry never overshadows his pragmatic contributions to their shared missions.

During a critical case, his academic fascination prompts him to procure an ancestral doll tied to Rem’s lineage, unknowingly awakening a 12th-century headless horseman and precipitating a spectral upheaval. Such incidents underscore his dual commitment to scientific rigor and occult exploration, even when his experiments inadvertently intensify dangers before solutions emerge.

Consistently portrayed as a methodical scholar, Kidou aids in combating dreamworld incursions by deploying advanced technology and psychological expertise. His documented engagements prioritize the fusion of intellectual discipline with the chaos of supernatural warfare, maintaining a steadfast focus on tactical collaboration over personal growth or elaborated history.