Mimei serves as a crew member aboard the Bardanos, a sand submarine helmed by Captain Bainas. Her design includes a heart-shaped slit on her back, termed a "reverse Ardis," a rare stylistic element evoking parallels to figures from Leiji Matsumoto’s broader works. Her attire stands out visually, contrasting with the aesthetic of other characters in the series.

She engages with protagonist Sam Coyne and the fugitive Maya, operating within a secondary narrative role. Her contributions emerge during tactical submarine operations and crew exchanges, such as a mess hall scene where her demeanor subtly shapes crew conduct. Interactions with Bainas and Sam touch on themes of duty and loyalty, though these dynamics remain concise.

Her background, origins, and personal history are undisclosed within the series or related materials. Her character undergoes minimal development, with no exploration of individual motivations, past experiences, or future trajectories beyond her duties on the Bardanos.

Expanded media, including spin-offs or films, do not elaborate on her storylines. Her role remains confined to stylistic and situational contributions within the central narrative framework.