Nitto sold its share of super hero models, along with Bullmark and Bandai in the Seventies.
The "Badge" series (so called because the model kit came with a metal badge, lithographed with the featured hero) included Mirrorman and Silver Kamen Giant, with a few of their monsters. These were "hashiru" or rolling models, so the hero or monster is mounted on what looks like a space ship with a pull-back motor beneath.
These still pop up on Yahoo Japan, but be ready to pay. They tend to be a pricey, and there are usually more than 2 or 3 bidders when these appear.
