The Man Who Could Become God or the Devil

Rin is enjoying a rather normal life living with his childhood friend Kaede due to family deaths on both sides. One day at school, two new classmates transfer into his class: Lisianthus, heiress to the Realm of the Gods, and Nerine, heiress to the Realm of the Demons. Rin is told that he has been picked to marry either one, though it will be his choice as to whom.