Astraia Tor Deikun first crossed paths with political leader Zeon Zum Deikun while working as a cabaret singer at the "Eden" nightclub during his early activism in the Autonomous Republic of Munzo at Side 3. Despite his existing marriage to Roselucia, she became his mistress, bearing two children—Casval Rem Deikun and Artesia Som Deikun. Though publicly perceived as his wife, their relationship remained informal, constrained by Roselucia’s legal status.

Astraia’s loyalty lay with Zeon himself rather than his political ideology, which she scarcely understood. She passively accepted the hardships of their union, enduring public scrutiny and separation from her children. After Zeon’s sudden death plunged Munzo into turmoil, Roselucia—consumed by resentment—had Astraia imprisoned. Confinement worsened her frail health, culminating in her death under Crowley Hamon’s care, a former Eden colleague turned ally in safeguarding her children.

Casval and Artesia fled to Earth under Jimba Ral and his son Ramba Ral’s protection, evading the Zabi family’s schemes. Astraia’s ties to allies like Hamon and Clamp, Eden’s bartender, offered fleeting solace, but her arc concluded amid the collision of political strife and personal anguish, her demise sealing her tragic narrative.