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Synopsis

Adapted from Tetsuhiro Koshita’s manga, this series follows siblings Retsu and Go Seiba after they receive miniature racing cars known as Mini 4WD from Dr. Tsuchia. The narrative centers on their development as racers: learning techniques, upgrading and customizing vehicles, and preparing to face Japan’s top competitors at the national Cup. The franchise spans multiple seasons; the initial installments concentrate on the Seiba brothers and their team, the TRF Victorys, while a subsequent season shifts primary attention toward two different protagonists yet retains the core emphasis on competitive miniature car racing and the challenges of training, teamwork, and technical refinement.