Golden Puzzle of Izayoi

I'm Sugaya Izayoi, an ordinary sophomore, maybe. But I joined an organization... Specializing in investigating supernatural and bizarre events.... Since a mission, I found a piece of gold fragments. We determined that these fragments are scattered all over the world, and that it has a special kind of radiation that will cause some incredible and bizarre events. The organization has placed a large reward on these fragments. We call it the golden puzzle. My mission is to find them and solve these bizarre cases. In the process of searching, I gradually discovered the terrifying secret hidden behind the puzzle. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.