Summoner (Summoner, #1)

Gryff never knew he was the most powerful summoner in the world until a rogue monster attacked his village.

Now he's been recruited into the top magical academy, beautiful women are breaking down his dorm room door, and the headmaster has big, big plans for him. Instead of summoners being maligned by society, Gryff is in a position to make them revered and honored.

There's just one problem: The most powerful fire mage in the academy wants to protect the status quo and will do anything to stop him.

This novel has harem elements.