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Yotsuba is not your average university student: she has the extraordinary ability to hear a car's "voice." She works at Quadrifoglio, an auto repair shop specializing in Italian and French cars. The shop is run by her grandfather, Gen Shijo, a former chief engineer for a famous racing team. Hideki Nakado, a foul-mouthed mechanic with a short temper who used to work at a dealership, is also there. Yotsuba is a member of the university Autocross Club and very busy, but everyday has fun in store for her.