Okiraku Ryoushu no Tanoshii Ryouchi Bouei

A fourth son of a marquis, Van becomes aware of his reincarnation as a toddler and is regarded as a prodigy due to his accumulated knowledge. His abilities eventually manifest in the form of production magic, which disappoints his family of mages. As a result, he is exiled to a struggling town on the brink of ruin. Despite its condition, Van sees promise in the place and begins constructing defenses. He aims to create a better future through his efforts rather than relying on traditional battle magic.