Tatsuya Mikage was summoned to another world to fight the Demon Lord reluctantly. After years of effort, he returns to Earth with an assassin girl named Henry and a Peach Dragon to find that 15 years have gone by and his parents have already passed away. Now without a proper education or connections to modern Japanese society, Tatsuya now lives using his alchemy cheats to make a humble living.

Yuusha no Katsuyaku wa Korekara da!: Isekai kara no Demodori Yuusha wa Heion ni Kurashitai began as a web novel on Shousetsuka ni Narou, and has been published in book format by Overlap since May 25, 2018 under its Overlap Novels label.