Keltia is a popular planetary member of the Galaxy Federation. It is a planet neighboring Fifth Jerusalem. Planetary development is said to have taken a mind-numbingly long amount of time, but now it is a rich and varied planet, with six billion people living their lives in a vast, temperate landscape. Keltia is the site of the Seraphim Sisters' latest concert - the home of Julia and Chloe. Captain Mathews was hoping to travel to Keltia to see the Sisters perform live, but his debt prevented him from going.