Shinrei Tantei Yakumo - Akai Hitomi wa Shitteiru

Shinrei Tantei Yakumo: Akai Hitomi wa Shitteiru serves as the foundational light novel that launched Manabu Kaminaga’s long-running supernatural mystery series. First published in 2004, the story introduces Yakumo Saito, a university student born with a red left eye that allows him to see ghosts. The work emerged during a period of rising interest in occult-themed detective fiction in Japan, blending traditional ghost stories with modern investigative procedural elements.

The character design and atmospheric tone were carefully crafted to establish a somber, melancholic aesthetic, often associated with the series' recurring illustrator, Katoh Akatsuki, whose work helped define the visual identity of the franchise across its many iterations. The novel was well-received for its character-driven focus rather than pure horror, eventually spawning a successful manga adaptation, multiple television series, and live-action stage plays, cementing its place as a staple of the Japanese light novel market.