Yakushiji Ryouko no Kaiki Jikenbo

Yakushiji Ryōko no Kaiki Jikenbo (薬師寺涼子の怪奇事件簿, lit. "Ryōko Yakushiji's Strange Case Files") is a series that consist of the anime TV series, manga and light novels created by Yoshiki Tanaka and illustrated by Narumi Kakinouchi. Two Drama CDs had also been released prior to the anime adaptation with different voice actors from the CD and the TV version.

As the light novels, manga and the anime have different plots and paranormal events/creatures, their central plots are most of the time different from each other.

Plot
Based on a series of light novels written by Tanaka Yoshiki and illustrated by Kakinouchi Narumi.

The story revolves around Ryouko Yakushiji, a 27-year-old multilingual investigator that graduated from Tokyo University's elite Department of Law, and the bizarre cases she faces while working for the Tokyo Metropolitan Police. Yakushiji not only has to deal with supernatural beings in her line of work, but also her rival Yukiko Muromachi, another equally talented and beautiful police investigator.