Sōma, the younger brother of Minami Uezono from whom he was separated during a prior incident, lost his original body in a terrorist bombing. This event ignited a deep-seated desire for revenge against those he held responsible. He eventually aligned himself with the group Al-Jaad, sharing their objective of vengeance. Sōma possessed a strong aversion to being pitied by others.

His story revolved around a cycle of revenge directed at Hayama Gaho and his family, whom he believed had ordered the bombing that killed his own family. He pursued this vengeance even after learning the events were actually orchestrated by another entity known as Beta. A turning point came when his sister, Minami, persuaded him to abandon his path of revenge. Subsequently, he performed a sacrificial act by taking a bullet intended for her. He was later shown to have joined Al-Jaad in death.