Mugen no Majutsushi: Maryoku Nashi de Heimin no Ko to Hakugai Sareta Ore. Jitsu wa Mugen no Maryokumochi.

Rest, a boy born between nobles and commoners, was diagnosed as having “no magical power”, but that was a falsehood; in truth, he possessed infinite magic. Treated and persecuted like a dog due to being a commoner’s child, he refused to remain a victim forever. “Someday, all of you will realize… that I am the one with infinite magic!” (Source: Kadokawa, translated)