Shion Saionji is a highly accomplished Zenonzard player, widely recognized within the competitive scene and nicknamed "the Queen" due to her exceptional skill, having achieved 22 consecutive victories. Her top-ranked status commands significant respect at school and within the Zenon tournament circuit. She partners with Ash Claude, an AI unit classified as a Codeman, forming one of the most dominant teams. Shion specifically targets Sota Azuma and his newly partnered Codeman, Eilietta Lash, for a match upon learning of Eilietta's existence, aiming to claim Eilietta should she win. This pivotal battle results in her defeat by Sota and Eilietta, ending her 22-win streak. Her role centers on establishing competitive stakes and serving as an initial benchmark for the protagonists' potential.