Sono Yuusha wa Nisemono dato, Kantei-shi wa Itta

is a Japanese light novel series written by Kyonosuke Seki, with illustrations by Reine Kuwashima. The series began publication on January 8, 2022 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
A world where a hero once visited from another world "Nippon" and rejected the dark army and saved the seven kingdoms. Now, while it is rumored that the darkness has begun to wriggle again, it is said that "I brave fraud", who calls himself a new hero, is rampant all over the world. "There is something I really want you to appraise! I heard that you are more familiar with the legend of the hero than anyone else." The request brought to Dout, who was a talented appraiser but continued his journey through rootless grass, was "I want you to appraise the truth of the hero." Norleen, a girl who is an apprentice priest, says that an adventurer with evidence of being a hero from "Nippon" is begging the cult. Is the true identity of the hero who makes noise in the streets? Or is it a scammer? A unique fantasy comedy that reveals the truth.