According to Dengeki, Sugii Hikaru's mystery novel "Kami-sama no Memo-cho" was announced to be getting an anime adaptation.

Kami-sama no Memo-cho drama CD website

A manga adaptation has been serialized in Comic Dengeki Daioh since June 2010.

Synopsis:
Fujishima Narumi is a plain high school boy, who has been isolated in his class. A classmate, Shinozaki Ayaka, invites Narumi to the gardening club and introduces a hikikormori detective Alice to him. Alice hires Narumi as an assistant to solve mysterious cases involving an illegal drug "Angel Fix". But the drug entraps Ayaka into danger.

Source: Scan of Dengeki no Kanzume

Update Apr 7
Staff
Director: Sakurabi Katsushi ("Shingetsutan Tsukihime", "Asatte no Houkou")
Series Composition: Minakami Seishi
Production Studio: J.C. Staff

Cast
Alice: Ogura Yui
Fujishima Narumi: Matsuoka Yoshitsugu
Shinozaki Ayaka: Kayano Ai
Min-san: Nabatame Hitomi
Tetsu: Matsukaze Masaya
Major: Miyata Kohki
Hiro: Sakurai Takahiro
Yondaime: Ono Daisuke

Source: Dengeki

Kamisama no Memochou on MAL