It is a common story that a former janitor of the Studio Hero Party was actually ranked as SSS except for combat. AlphaPolis

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Winner of the 11th Alphapolis Fantasy Novel Grand Prize and Readers Award! Kurt, a boy who was kicked out of a hero party because he was useless in a battle. When he received a aptitude test in the town, he found that his aptitude for battle was all of the lowest. He was asked to do construction and mining to make a living, but he was also useless here. He was very active with eight faces and six arms! In fact, Kurt was of the highest rank in everything except for battle. However, he didn't realize that, and he solved the problems of various people by taking careless actions, and finally saved the town and the country?