Rei fights alongside protagonists Loof and Jin as a member of their psychic warriors group, opposing the Genma forces. She wields potent psychic abilities centered on teleportation and phasing through solid matter, proving strategically vital in missions against the Genma regime.

Her teleportation allows her to blink across combat zones, while her phasing capability lets her slip through walls and evade attacks. These powers cement her role as a tactical asset within the team.

Rei maintains a strictly professional relationship with the twin protagonists, collaborating closely to undermine Genma leadership. She participates in coordinated assaults targeting key Genma figures and installations. Her skills directly complement Loof's telekinesis and Jin's aggressive psychic manifestations during confrontations.

She demonstrates unwavering loyalty to the group's objectives throughout their campaigns. Rei remains actively engaged in operations disrupting Genma's control over humanity and challenging the demonic rulers' hierarchy. Her presence significantly bolsters the collective capability of the psychic resistance.

Rei's background prior to joining the resistance remains unspecified. Her character development manifests primarily through demonstrated commitment to the group's missions rather than extensive personal narrative arcs. She fulfills a specialized combat and reconnaissance role within the ensemble of psychic operatives fighting the Genma occupation.