Out of Japan's 220,000 police officers, only 500 are professional investigators. This comparison alone shows the difficulty of passing such an exam.,In this world, there is no tradition of ancestral rites. The protagonist's hometown in a parallel world is located in the town of Kamikawa, Kamikawa County, Hokkaido, where his family has been operating an onsen ryokan for generations.,PS: A 22-year-old detective is possible, the protagonist's birthday is set later, so he is still 22 after graduation, besides, that's how twisted the occupation group is.。