According to MoonPhase's anime list, the detective/
youkai novel
Mouryou no Hako by
Kyougoku Natsuhiko will be getting animated.
魍魎の匣
Mouryou no Hako
The novel was published in 1995 under the general novels label
Kodansha Novels.
Here its cover:
A manga adaptation of the novel is serialized in the horror manga anthology
Comic Kwai, and its being drawn by Shimizu Aki.
For now there's 1 volume released of the manga.
Cover:
Staff:
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Orriginal Work: Kyougoku Natsuhiko
Director: Nakamura Ryousuke
Series Composition: Murai Sadayuki
Original Character Concept: CLAMP
Character Design: Nishida Asako
Color Design: Shinohara Megumi (???)
Propp Design: Kimura Masahiro
Animation Production: MADHOUSE
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There's a live-action movie of this novel, here its official site:
http://mouryou.jp/