魔法科高校の劣等生 追憶編

Three years before they enroll at First High, Tatsuya and Miyuki Shiba are still uneasy siblings on a family trip to Okinawa. When an unidentified armed force lands and the holiday turns into a battle, Miyuki learns what her brother's real role and abilities are, and nothing between them is the same afterward. This hour-long television special is a prologue to the main story, framed as Miyuki's memory of that trip.