Ryoko's Case File is a tV series anime that premiered in summer 2008, produced by Doga Kobo.

About the production: the story comes from a light novel, there are 13 episodes of about 23 minutes and its current status is "finished".

Its main genres are mystery and supernatural, with themes such as Police, Primarily Adult Cast and Female Protagonist.

On AniList, Ryoko's Case File has an average score of 66%, a good score, and appears on 4,717 users' lists.

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. (Source: AniDB)

Official synopsis from AniList.