"A 22 years old, Criminal Investigator and Detective student was found dead inside the school's cubicle..." A year ago, horrifying and mysterious incident happened in Criminal Investigation and Detective Management Department of Horizon Detective School, it still remain unsolved no one dare to finish it even the higher ups, but there are 7 students who are under that Department tries to open it again. Would they solve it or maybe not? Are they all gonna end up like Justice?