Life in Equestria is grand for the sole human there. A loving wife, a mostly stable marriage, and a very supportive family that he's more than eager to do the same for. Best of all he now holds the title of Prince! A summons from Celestia calls forth Justin, the first human Prince of Equestria, for a matter she wishes to discuss with him personally. Good thing he's already in Canterlot so he suppose it wouldn't hurt.