QED Suwa No Shinrei (Kodansha Bunko)

[Machine Translation] The "Gobashira Matsuri," in which men wildly crowd around a gigantic mihashira sliding down a slope, and the "Mitou Matsuri," in which the heads of as many as 75 deer are sacrificed. Takashi Kuwabara and Nana Tanahata visit Suwa-taisha Shrine in Nagano Prefecture to investigate these strange festivals, and encounter a mysterious series of murders. The "sacred pillar," the "sacrificial pillar," and the "grudge pillar" are the mysteries that have continued for 1200 years. When the mystery that has continued for 1200 years is solved, the truth of the case is also revealed.

坂を滑り落ちる巨大な御柱に、男たちが荒々しく群がる「御柱祭」。75頭もの鹿の生首が捧げられた「御頭祭」。長野県・諏訪大社に伝わる、これらの奇祭を調べるため、同地を訪れた桑原崇と棚旗奈々は、不可思議な連続殺人事件に遭遇。御柱‐御贄柱‐怨念柱。千二百年続く謎が解けたとき、事件の真相も明らかに。