Ryuji was summoned to another world as "the best recovery magician" when he was a salaryman in Japan. However, the summoning seems to have been a mistake, and Ryuji is immediately thrown away. Tired of living as a corporate slave, he decides to enjoy a slow life in another world, but at that time he acquires a mysterious skill called "castle magic" instead of "white magic". "Is it just a gag skill?" However, this "castle magic", which was thought to be out of the ordinary, is actually a non-standard magic...!? Ryuji unconsciously plays an active role in. Furthermore, with the addition of new "wrong skills" bestowed by the fairies, he continues to gain fame as the strongest healer... "I just want to live the slow life I've longed for!" A relaxing (?) different-world fantasy by the strongest healer who has suffered from various mistakes!