Queen Shin, formally Shin-Oh Harumiyah, became ruler of Lyoza at five years old after the Sai Gamulu faction assassinated her mother and grandmother. This early loss forged a significant disconnect from her royal heritage, leaving her largely unaware of her ancestor Jeh's origins and the Royal Beast Canon's true purpose governing the kingdom's sacred creatures.

She reigned as the Yojeh, a divine descendant of gods believed to dwell beyond the Afon Noah mountains, wielding spiritual and political authority over Shin-Oh. Her rule reflected a gentle, compassionate nature, marked by a deep aversion to conflict and genuine concern for her subjects' welfare. Her family included her distrusted adult nephew Damiya and her granddaughter Seimiya, whom she raised after Seimiya's parents died in a traffic accident.

A pivotal moment occurred during her visit to the Kazalumu Beast Sanctuary to observe a newborn Royal Beast cub. Toda riders ambushed the visit; Queen Shin sustained a head injury from a fall. Though she initially recovered and held a critical discussion with Erin about the Royal Beast Canon's history and the perils of exploiting beasts for war, she succumbed days later to a brain hemorrhage caused by the injury. Her death was later revealed as part of an assassination plot orchestrated by Damiya, who framed the Aluhan's forces to incite civil unrest.

In her final days, she expressed gratitude to Erin for revealing the truth about her ancestor Jeh, a priestess who founded Lyoza after Ofahlon's destruction and established the Royal Beast Canon to prevent future creature misuse. This conversation illuminated her lifelong struggle to reconcile her inherited role with her lineage's lost knowledge.