Yayoi Kobe
    Yayoi Kobe
    Hitoshi's self-proclaimed "beautifully developed and big-breasted little sister". Younger than him by two years, she is loud and energetic, and has a few psychological problems. Like Hitoshi she is a talented programmer and has developed her own A.I. program, named "Ma-kun", whom she wears around her neck inside a tamagotchi.