Rei

Rei is a student studying at the M.M.R. Vocational School. She is often seen accompanied by robotic penguins collectively known as "Naru." A third-year student from the M.M.R. Vocational School, who nevertheless has the appearance of a small child. Despite the fact she is childlike in both her demeanor and personal hobbies, she utterly despises being referred to as "kid" or "little girl." As a senior, she feels obligated to take care of her fellow students who are younger than her, and spares no effort in doing so.