Sekai no Chuushin, Hariyama-san

is a Japanese light novel series written by Ryogo Narita, with illustrations by Yasuda Suzuhito and Katsumi Enami. The series began publication on October 10, 2005 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Various events that take place in Tokorozawa City, Saitama Prefecture.

The urban legend that an ax man is aiming for his life under the bed, the magical girl who suddenly broke the ceiling and descended, the isolated island where the inhabitants who call themselves heroes disappeared suddenly, and the fate of various people The end of the intertwined tragedy. There was always one person involved in all those cases. The man's name is Shinkichi Hariyama .... An ordinary person with an unhateable face and almost no features other than glasses.

Why is he involved in every incident?

Who is he !?