Ninjara Hoi! is an RPG made in the style of the more well-known Dragon Warrior, which itself spawned a number of clones back in the '80s and '90s. It's known as a bit of a humorous game in same vein as Tengai Makyou, with much of its humor centered around on various pop and historical figures of Japanese culture.
This game, along with a number of other Famicom titles by ASCII, uses an expansion plug-in for the Japanese Famicom known as a Turbo File. This Turbo File is essentially a memory card, compatible with a number of other ASCII titles at the save time to store save data from the game. Those attempting to play this game on an actual non-Japanese NES or most emulators will not be able to save their game in the traditional ways as intended by the game; you will have to leave the console on or use save-states, respectively, to retain game progress.