The Mazda R360 Coupe is a kei car that made its debut in 1960 as a 4 seater, two door coupe. Production lasted for 6 years, till 1966.
This R360 Coupe had rear mounted, air cooled a 356cc V-twin engine which produced 16 horsepower or 12kW. She had a max speed of 95km/h.
These photos were taken at the Fukuyama Auto and Clock Museum. There are photos of another R360 Coupe taken at the Mazda Museum here: https://www.japanesecarfanatic.com/1960-mazda-r360-coupe/