UX-9 is one of the UX Series Star Systems between Old Yamatai and the Ketsurui Military Sector. It has a habitable world, UX-9 II, that is pretty Earth-like except for its dense atmosphere. In YE 35, the Yamatai Star Empire laid claim to this star system. The Yamatai Star Empire placed orbital communications networks of Emrys Satellites around all of the terrestrial planets in YE 36.

In YE 41, this star system was conquered by forces from the Interstellar Kingdom Of Kuvexia during the Kuvexian Invasion of YE 41.

• G5 V Yellow Main Sequence
• Radius 6.53 x 10⁵ km (0.94 x sol)
• Mass 1.36 x 10³⁰ kg (0.68 x sol)
• Temperature 5400 K
• Luminosity 4.47 x 10²⁶ W (1.17 x sol)

• Rock Planet
• Orbital Radius 7.38 x 10⁷ km (0.49 AU)
• Period 3.67 x 10³ hours (0.42 earth years)
• Gravity 10.65 m/s² (1.09 x earth)

• Type Terrestrial World
• Orbital Radius 1.25 x 10⁸ km (0.83 AU)
• Period 8.05 x 10³ hours (0.92 earth years)
• Physics Large ocean
• Gravity 15.10 m/s² (1.54 x earth)
• Hydrosphere 75 % water, 2 % ice
• Atmosphere Dense breathable
• Biosphere Prokaryotic microbes
• Special Heavy volcanism

In YE 36, this planet became part of the PAINT public transportation system and has a Tenba that regularly visits and provides passenger flights to Shinjuku Starport on Hanako's World.

• Type M3 V Red Dwarf
• Distance 5.82 x 10⁸ km (3.89 AU)
• Radius 2.32 x 10⁵ km (0.33 x sol)
• Mass 3.45 x 10²⁹ kg (0.17 x sol)
• Temperature 2900 K
• Luminosity 1.95 x 10²⁵ W (0.05 x sol)