The moment Wataru, an office worker, dies in an unreasonable accident, he is caught up in the summoning of a hero. By some coincidence, he ends up being reincarnated with a special privilege called ``tutorial skill'' that can only be used during the tutorial period before his reincarnation. Wataru, who started living in another world as an 8-year-old boy, started living a carefree life using a variety of extremely useful skills. Wataru lives a lively life in the Nekomimi village with his pet dog Kotetsu that he summoned from his previous life, Elena, a cheerful girl from the Nekomimi clan, and the slimes he tamed. At that time, he meets a beautiful demon lord who was being oppressed by a reincarnated hero who goes crazy!? A super heart-warming adventure story in which a kind-hearted boy makes everyone in another world happy begins!1