Rise of The Demon Lords — James E. Wisher

Conryu Koda wants nothing more than to be left alone to live a quiet life. But the universe seems to have other plans for him. While back at the Arcane Academy to watch his friend's graduation, Conryu is summoned to hell by The Reaper himself. What new threat has appeared that warrants the attention of the lord of hell? Whatever it is, it can't be good for Conryu and those he cares about.