Order Rank By (author): "Son Hee-Joon"Genres:Fantasy books Graphic Novels books Action books Manga books Manhwa books ISBN1595323252ISBN139781595323255AsinOrder RankOriginal titlePhD: Phantasy Degree Volume 7 (Phd Phantasy Degree)SeriesPhD: Phantasy Degree #7A story that features rings, different worlds, and different leagues of beings.