Responses
Hereee pretty sure its this one !
https://www.mangago.zone/read-manga/kenja_no_mago/
Thank u so much!!
MC, a boy that was taken care by a granpa who is known as the strongest magi together w his grandma. MC is overpowered he also have a partner who he met when he first came in the capital being harassed by some men. His partner from a high rank family w long blue hair. Very sweet. MC was also very protective of her so he customized her uniform by casting magic on it. He also cast magic on some of his friends' uniform.