Mei-chan no Shitsuji

The story revolves around a young woman named Mei, who was rescued as a young girl by someone calling himself her "butler". With only a vague memory, though, the experience seems like just a dream. But one day, after her parents' accidental death, he appears: Rihito comes from a line of outstanding butlers, and he has been appointed to serve her! Now her ordinary life has completely flipped, as she discovers that she's actually the heiress to a fortune, and is forced to transfer to St. Lucia Girls' Academy, where all the students have butlers! As a result, her childhood friend, Kento, decides to enroll in a butler school so that he can stay close to her.
(Source: Tokyograph)
~~ Adapted from the manga "Mei-chan no Shitsuji" (メイちゃんの執事) by Miyagi Riko (宮城理子).