Core is a maid serving the G-Society, an organization working to return power to those descended from Earth. Her principal role involves attending to Letuchaia, whom she addresses as "sister-princess." Alongside standard maid duties, Core conducts espionage for Letuchaia, using glasses with concealed cameras to secretly monitor other G-Society Shadow Workers.

She displays particular interest in the interactions between the male Shadow Workers Torch and Shade, showing visible excitement when observing their close personal relationship, indicating fujoshi tendencies. Core's concern extends beyond Letuchaia to include Pauki, Letuchaia's brother, reflecting her protective nature toward both siblings.