Desert Coral Vol 2

Desert Coral Vol 2 by Wataru Murayama. A Fantasy manga rated All Ages, published in English by ADV in 2000.

Naoto Saki is an ordinary high school student who has dreamed for years of a fantasy world called Orgos. When the sorceress Lusia summons him there in the middle of her battle with a rival, Naoto suddenly has a physical body in that world and is visible to everyone in it. A fantasy adventure that blurs the line between dreams and reality.