It is a common story that a former janitor of a party of a false studio owner hero was actually ranked as SSS except for battle (8). AlphaPolis

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Kurt, a boy of the highest rank in all aptitudes except for fighting, such as mining, cooking and construction. His unconventional talent is recognized by those around him, and if he comes to his mind, he is made into the country's top engineer and "factory owner." However, he is completely unaware of his talent and doesn't know anything about it. The factory that was his base was completed, and the Kurt spent their days in peace. However, the magic hand that chases the country's third princess, Lise, attacks Be Sakaimachi.