3H Personal-Type '94 is a Humanoid Home Helper robot owned by the Robotics Club at First High School. The club calls her Pixie.
She first showed up in volume six of the light novel series, popping up during prep work for the Thesis Competition. Her appearance was pretty brief, but she ended up being useful—the evidence she recorded helped Tatsuya figure out which organization Sekimoto was actually working with.
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