Distortion

A teenage hero. The fate of a universe. Every second counts.
Travis Shepard is respectful and diligent, right up until he's nearly expelled from high school.
... That is, until he manages to slip into another world, awakening an ancient destiny. Travis is to be Exalted, chosen by the guardian deities of the Seven Realms of Existence as a defender of life itself.
With the help of nothing more than an ancient spirit and a floating book, he quickly learns there's more to being a hero than just a brave face and a pair of wings.