Ancient City Insurrection Part II (S03E10)

In order to obtain cooperation from Retsu Kudou to capture Gongjin Zhou, Tatsuya, Miyuki and Minami visit Nara, the home of the Kudou Family. Retsu Kudou readily accepts Tatsuya's offer and introduces him to his grandson, Minoru. Minoru is one year Tatsuya's junior, and although he is physically weak, he is said to be a very powerful magician. At the dinner table, Minoru hears that Tatsuya and his friends are looking for a traditional magic user and offers his help. The next day, as Tatsuya and the others are scouting the Traditionalists' base in Nara under Minoru's guidance, they are attacked by the Traditionalists at Nara Park. (Crunchyroll)