An eccentric artist is found brutally murdered in a room locked from the inside. His diaries reveal dabblings in alchemy and astrology, and a macabre plan to kill and dismember seven women in an occult ritual. Then, shortly after his death, the artist's bloody project is carried out, as if from beyond the grave...

Decades later, astrologer and amateur detective Kiyoshi Mitarai sets out to solve these notorious crimes. His investigation leads him across the country towards a dark, shocking truth. But can you unravel the mystery of the Tokyo Zodiac Murders before he does?