Casebook of Kurumi Tokisaki, Magic Detective (light novel)

“THE TIME HAS COME TO SOLVE THIS CASE!”Artifacts—magical tools with abilities that surpass human understanding. After dozens of these powerful items are stolen, supernatural crimes begin happening all over Tengu City. Luckily, one girl can solve them all: magic detective Kurumi Tokisaki. Along with her companion Matsurika, Kurumi attempts to unmask the dastardly thief, and in the process, retrieve the Artifacts. However, as each incident is resolved, the identity of their mysterious perp only becomes less and less clear. How will the ace detective close her biggest case yet?