Skill "Gousei" ga Tanoshisugite Saishou no Mura kara Derarenai

Sen was an average boy living in the Town of Emel who admired adventurers. When he turned 15, he underwent the revelations ceremony where he received the unheard-of skill, “Composite”. Curious about the kind of ability it was, he combined various materials and ended up creating magical tools and items that were unbelievably powerful. As the items he made were unimaginably powerful, Sen hid his ability while compositing new items to his leisure. But, a man dressed in a strange outfit appeared before him one day, causing a great change to his peaceful life— Source: AlphaPolis