The Star Army of Yamatai's First Expeditionary Fleet is a strong, experienced organization of ships and soldiers based at Yamatai. The 1st SF is closely associated with the Ketsurui Clan and Ketsurui Fleet Yards and is commanded by Kessaku Irim.

The First Fleet's mission is to:

• Fight the enemy in space combat.
• Protect Yamatai.

The First Division is the First Fleet's main fighting element. It is compromised of powerful capital ships.

• 60 Sharie-class Battleship
• 742 "Super Eikan" Heavy Cruiser

• 100 Nibasha-Class Heavy Freighter
• Raccoon T7 Transport Shuttle (many)

Five gunships serve as Taisho Yui's personal guard.

• 1SF Ketsurui Samurai Detachment

• "Irim's City" (NK-S1-01)
• Virginia Depot
• Anisa no Iori (Anisa)
• Ohara Star Fortress (Custom-built Ohara Star Fortress at Ohara)