Ryuji was called to a different realm as "the best recovery magician" while he was a salaryman in Japan. However, it seems that this summoning was a blunder, leading to Ryuji being quickly discarded. Fed up with his existence as a corporate slave, he resolves to experience a slow life in this new world, only to discover that he has obtained an unusual skill known as "castle magic" instead of the anticipated "white magic". "Is it merely a gag skill?" Yet, this "castle magic," initially perceived as unconventional, turns out to be a unique form of magic...!? Ryuji unintentionally becomes quite active with it. Additionally, with the new "wrong skills" granted by the fairies, he continues to rise in prominence as the greatest healer... "I simply wish to live the slow life I have always desired!" A chill-inducing (?) fantasy from the perspective of the strongest healer who has endured numerous blunders!