Chris, the third son of the Ford family, was expected to have a great future, but he grew up to be incompetent. His nickname became "The Blockhead." Because of his extreme incompetence, he was disinherited at just twelve years old. One day, Chris discovers a mysterious grimoire in the library. It was a book that allowed him to adjust parameters and use modified versions of various spells. Having always been interested in magic, Chris is excited by this. He modifies various spells and uses them one after another. As Chris lives his free and easy life creating new magic, one difficult problem after another falls upon him. However, Chris doesn't notice. Without even realizing it, he somehow ends up solving all the problems.