Mayuri Shiina (椎名 まゆり), is Rintaro Okabe's childhood friend and companion. She works part-time at a maid cafe called May Queen Nyan-nyan as a costume maid and occasionally makes cosplay outfits. She is also the second member of Rintaro's Future Gadget Laboratory. She is usually the one who financially supports Rintaro's "research" when food is needed. Although she possesses an extremely childish and naïve attitude for her age, she's also very attentive to details, often noticing things about people that others would miss.
