[Sekai Saikyou no Shitsuji] Black Shokuba wo Tsuihou Sareta Ore, Kouri no Reijou ni Hirowareru

Alto is the hard-working butler for Wendy, a very selfish young lady. Finally, he collapses from overwork and is forced to leave the mansion. Lost on the street, he meets Uruk, the feared "Lady of the Ice". This is an isekai fantasy where the main character makes full use of the "original magic" he developed through his butler skills!
(Source: Tonari no Young Jump, translated)