Shin Mahouka Koukou no Rettousei: Cygnus no Otome-tachi Cygnus Maidens: The Irregular at Magic High School

Synopsis

The series moves away from the Shibas and focuses on Alisa Iba, now Alisa Juumonji, the half-sister of Katsuto Juumonji, who came about due to their father having an affair before remarrying after the death of his first wife. (Source: Mahouka Koukou no Rettousei Wiki)