Jeruna Flarestar became the first esper recruited by the Galaxy Patrol System Cosmo Police, channeling her significant abilities primarily into desk duties. She discovered and raised Justy Kaizard from childhood, forging a sibling-like bond through shared adversity. This connection evolved into complex romantic feelings layered over their deep familial affection, absent any blood relation. Her past included commanding the elite Esper Commandos during the Great Galactic War against the Andromeda Rebel Army. In a pivotal battle, she defeated the enemy leader but sacrificed her life in the act. Her legacy endured within the Cosmo Police, influencing operations and personnel long after her death. Jeruna also embraced a protective, nurturing role toward Astaris Vega, whom Justy welcomed into their home after her father's death, aiding the girl's upbringing and integration into their lives.