Meet Hiroki Tanaka, a regular office worker who, after an unfortunate accident, finds himself reincarnated in the world of a popular light novel. But there's a catch – he becomes a seemingly insignificant character with no extraordinary abilities. Everything takes a hilarious turn when Hiroki accidentally becomes the central figure of the story. During an encounter, he mistakenly kills the main villain, halting the hero's growth and inadvertently aiding the evil organization's plans. Now, with the hero unable to fulfill his destiny, Hiroki must navigate this new world, filled with magical creatures, dungeons, and political intrigue. The evil organization sees him as an unexpected ally, and Hiroki must decide whether to embrace this role or find a way to rectify his mistake.