Tantei Shikkaku

is a Japanese light novel series written by Chuui, with illustrations by Zerokichi. The series began publication on December 10, 2011 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
The Western-style building "Hell Hall" has a symbol of foreign law, the Immortal Princess.

When the dangerous beautiful girl "Haunting God" Otoko Kurozuka and "Detective Disqualification" Takashi Sorano visit the hall, a strange case begins.

Is this case unreasonable? Or-a strange, subtle and clever detective story appears!