Based on novel by Kaminaga Manabu. Shinrei Tantei Yakumo, aka psychic detective yakumo, tells a story about a college student, Saitou Yakumo who is born with different eye colors. His red left eye gives him a special ability to see ghosts and spirits. He believes ghosts and spirits are bound to earth because of a certain 'cause,' and simply eliminating that 'cause' will let those spirits rest in peace. Being asked for help by Ozawa Haruka, they begin the investigation together.
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Includes an unrelated side story called Pen x Pal in vol.1.