Reika Mutō operates within the Special Weapons Enforcement unit, targeting individuals with psychic abilities through direct combat engagements. She participates in coordinated missions against key psychics, including Naoto Kirihara. During an operation in the psychic realm, Reika Mutō and Michio Sonezaki attempt to eliminate Kirihara, but Masayuki Tachibana intercepts their assault. Masayuki deploys his psychic powers to dissolve both Reika Mutō and Michio Sonezaki, resulting in their deaths. Reika's role remains confined to tactical field operations, excluding command-level responsibilities. Her combat focus and firearm proficiency define her as a warrior and gunslinger within the unit.