Mayumi Saegusa is a prominent supporting character in the anime series 'Mahouka Koukou no Rettousei' (The Irregular at Magic High School). She is the eldest daughter of the prestigious Saegusa family, one of the Ten Master Clans. As the student council president of First High School, Mayumi is known for her intelligence, charisma, and exceptional magical abilities, particularly in long-range precision magic. Her friendly yet mischievous personality adds depth to her interactions with the main characters, especially Tatsuya and Miyuki Shiba.