Ninja Survivor.io

Since ancient times, deep in the mountains, ninjas have trained to uphold justice. They carried out various missions to protect people, but one day, evil-hearted ninjas stole an ancient scroll and summoned monsters to conquer the world. Many ninjas were killed in the onslaught by these evil ninjas. Only one promising young ninja survived. Now, as the sole remaining ninja, he must stand against the evil ninjas and monsters to save the world. There is no room for even a slight mistake in the battle against the overwhelming monsters. Become the only ninja, grow, and survive!