Roa, a young S-rank adventurer, had been working alone all this time because he caught the eye of a nobleman's youngest son. However, he endured that misfortune only until he could raise his sister in place of his parents! With his sister's graduation from magic school safely decided, Roa retires from being an adventurer to gain his freedom. Aiming for his long-cherished slow life, Roa heads all by himself to a dangerous zone that only S-rank adventurers can reach. Roa luckily arrives at the憧(adored) sanctuary depicted in fairy tales. However, for some reason, people with their own circumstances keep arriving in the dangerous zone one after another, along with their troubles!? To immerse himself in his longed-for slow life, Roa makes full use of the skills he polished during his adventurer days to struggle and solve these troubles――. A slow-life-style, helping-others fantasy by the kindest, strongest magician, begins!