1.5l, that model IIRC. I wanted one once, thought they were very practical and interesting design, well specced. Optional artifical grass on dash for holding small objects, coins and cards etc, switchable interior light colours, all kinds of good stuff.
https://en.m.wikipedia.org/wiki/Nissan_Cube
they have 1.3 Micra running gear so as @danstuff says, not a Kei car.