Parental Warning: This game has been rated M (Mature) by the ESRB and is not suitable for players under the age of 17. When a weaponized parasite called the Alpha-worm infects an entire village, the Alpha Site, its victims mutate into bloodthirsty monsters. The parasites spread so quickly that the entire area had to be "sterilized," and the events surrounding the infection were hidden from the public to avoid worldwide panic. However, on August 12th, 2015, another outbreak was detected in Tokyo, Japan. The infection spread instantly and the United Nations saw no option but to order the total sterilization of Tokyo. Is there time left to save the city from destruction and prevent the spread of these deadly parasites? Only you and your ninja squad can save the day. Use unique ninja abilities and weapons to defeat mutated creatures in this top-quality game.