Little Ninja Brothers is the second game in the “Super Chinese” series* and the predecessor of Super Ninja Boy on the SNES. It was developed and published by Culture Brain in Japan in 1989. North America got it in 1990 and Europe in 1991.
It is an excellent one or two-player level-grinding RPG, with random battles, but instead of turn-based combat you get real time beat ’em up action instead, and works very well.
The King of Grabs 