Magika No Kenshi To Shoukan Maou

From ANN: Kazuki Hayashizaki is a sword master who, after receiving a mysterious sign from a god-demon that uses summon magic, enters the magic department of the national knight academy. Though he was supposed to be the successor to the Hayashizaki sword technique, he begins a magic class with all girls. He will use both sword and summoning in the school battle coliseum.