Case file for the mystery game "DETECTIVE X". - Title: DETECTIVE X - Author: Shusuke Michio - Case File Number: CASE FILE NO. 1 - Other Information: Mystery Game Thank you for viewing. I have played it, but there are no markings or writings. There is a slight feeling of use, but I have put the contents back in the box in the same order as when I purchased it, so you can use it without any problems for solving the mystery. Regarding the consumable incense, it has been used, but you can proceed with the story by viewing the hint site.