Where the Heck Am I?

Mason is just the average teenage boy. He goes to highschool, lives with his parents, and hangs out with his friends. Everything is normal. Until he finds a mysterious book in his locker.
When he opens it, it transports him to a strange world. There, he meets a girl named Suma.
He is brought back to her camp and told about an up coming war. Mason, in return, tells them how he got there.
They agree to help him find the book that brought him there if he helps them in the war. During preparation for the war, Mason soon finds himself falling for the female warrior, Suma. You know what they say. Opposites attract...