Investigation of Disaster

is a Japanese light novel series written by Akukiji Tora, with illustrations by Akabane. The series began publication on September 10, 2013 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Shingo, a young detective who was in the window department, was suddenly ordered by the chief of the station, Berkman, to investigate a serial murder case with Marie, a strange girl in elementary school who speaks in a veteran tone.

The name of the murderer is Harry Lloyd. He is a thug who has killed three women and has lost his way by returning to the special forces "CSC" of the city police. Marie, who has many "units" embedded in her brain that have the effect of strengthening her senses and increasing her knowledge, while she looks young, and Shingo, whose guns and "units" are crazy, but her Jiu-jitsu skills and intuition shine.

Can the investigation line of only two people really catch Harry Lloyd !?