Katejina is a strong-willed seventeen-year-old girl from Uwig, who was a pen pal of Uso Ewin. Separated from her parents around the time of the destruction of her hometown by the invading BESPA forces of the Zanscare Empire, Katejina joins the League Militaire with young Uso Ewin. However, Katejina disapproves of the League's reliance on Uso as a Mobile Suit pilot, due the mounting toll on his young body and mind.

Katejina is captured by Lt. Cronicle Asher, and taken to the Zanscare Empire, where she becomes Cronicle's personal assistant. Later, she trains as a soldier, eventually becoming a Mobile Suit ace pilot. It is during this period that her attraction to Cronicle, and hatred of Uso, begins to grow. Her personal support for Maria's matriarchal ideals, her annoyance at Uso's continual attempts to interfere with what she views as her true happiness, and her sheer admiration for Cronicle turn her into a dangerous Zanscare loyalist.

She and Uso battle on several occasions, where she succeeds in killing several members of the Shrike Team, as well as Odelo Henrik in the process. In the ending stages of the war, she demonstrates awakened Newtype abilities much like Uso, being able to see beyond her visual sight, and can cause normal people to hear her voice. Unfortunately this only ends up amplifying her selfish and spiteful ways until she is unable to survive without conflict. This ultimately drives her into a final battle with Uso in his V2 Gundam, causing her complete mental collapse in the heat of battle among the collapsing Angel Halo.

After the end of the war, having lost all her memories and her eyesight, she traveled back to her hometown of Uwig as a broken woman. On the way, she met Shahkti Kareen, who sympathetically offered her a new electronic compass.