It is a common story that a former janitor of a party of a misunderstanding studio owner hero was actually ranked as SSS except for battle (6) AlphaPolis

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Kurt is a boy who doesn't realize that he is an SSS rank for all his aptitudes except for combat. He was working as an acting studio owner without knowing that he was the real studio owner. Kurt and his studio friends found a hidden room that had been destroyed in the ruins of ancient civilization, where he went to investigate at the request of a court magician. In front of them, Kurt's former colleague, Bandana appears. According to her, ヴィトゥキント, a man who was recognized as a studio owner in seven countries for his many achievements, destroyed a hidden room and stole ancient civilization's technology. Kurt sneaks into the ヴィトゥキント studio to find out the truth. - The 6th Fantasy Misconception by the Most Gifted Boy Outside Combat!