Little Ninja Brothers © 1990 Culture Brain
North American release. Game developed in Japan. See the original Famicom version for more information: "Super Chinese 2 - Dragon Kid [Model CBF-C2]".
Description from the back cover:
Start out on a journey. You are spirited Ninja boys, Jack and Ryu. Now, go out on your journey to save the once merry world, Chinaland!
GAME ID: NES-C2-USA
Released in December 1990 in the USA.