The GIII League (ジーサード・リーグ Jiisaado Reegu?) is a neutral organization led by Kinzou Tohyama (codenamed GIII), formed by his fellow Genions (人工天才（ジニオン）?) and former pursuers. It joined the Deen faction, after Kinzou's defeat by Kinji.
| Butei | Butei Law • Butei Ranks • Butei Academy Uniforms • Team Formations • Caravan • Amica • Quartet • Lumberjack |
| Butei Curriculum | Assault • Lezzad • Connect • Inquesta • Logi • Medica • Research • Intern • Masters • Colt |
| Powers and Tools | HSS • Irokane • Stealth • Fuchou Poison |
| Locations | Tokyo Butei High School • Hotogi Shrine • Nagoya Butei Girls Academy |
| Organizations | Butei • IU • Ranpan • Team Baskerville • Bandire • GIII League • Regiment Hex • Kinokuni • Public Division 0 • N |
| Families | Tohyama Family • Mamiya Family • Ulus Tribe • House of d'Arc • The Cao Clan |