Ninja Blade  The player plays as a modern-day ninja, using a katana, twin swords and broad sword as the main weapon to the hostile creatures. Combat system is similar to "Ninja Gaiden" or "Devil May Cry". A chi bar is used up when "ninja vision" or ninjutsu is used. The gameplay is highly cinematic, relying on quick time events to finish missions; after attacking a boss until the health bar is empty, the player must perform a finishing move, called the "todome". In 2011, the inhabitants of a small Northern African village are infected by an unknown hookworm parasite, classified as "Alpha-worm", which alters its hosts' bodies and minds while increasing their strength and resilience. To prevent an outbreak, the military raid the quarantine zone and exterminate the infected, while the incident is covered up by the government. Military intelligence forms a containment task force called GUIDE (Global United Infestation Detection and Elimination), recruiting operatives from around the world. Four years later, a GUIDE ninja team, including the young Ken Ogawa and led by his father Kanbe, is dispatched to Tokyo to contain a massive Alpha-worm outbreak. Following Kanbe's trail, Ken chases and defeats an Arachne creature, however Kanbe and fellow team member Kuroh, having been infected by King Worms, slaughter the entire unit. Kanbe runs Ken through with the clan's 'Ninja Blade', narrowly missing his heart — something a master swordsman could only do on purpose. After a quick recovery, Ken is dispatched solo back to the city. As Ken eliminates other major Alpha-worm Carriers, he is informed that the military are considering a mass sterilization of Tokyo via orbital laser cannon, which will sacrifice its entire population. He then pursues two more King Worm hosts, a father-daughter pair of Yakuza bosses Oyabun and Ryoko Kurokawa. After defeating both, Ken witnesses Ryoko momentarily regain her sanity and beg for a mercy killing, which re-ignites hope in Ken that he may still save his father. After thwarting an attempt to spread the infection overseas through a plane carrying evacuees, Ken learns that Kuroh has attacked the local shopping mall and rigged the Tokyo underground with explosive Carriers called Blast Mites. Ken disposes of the Mites, catapulting the last one into the air out of harm's way. The bombing, however, was meant as a distraction to allow Kuroh to lead a strike team of Carrier military operatives into the GUIDE headquarters.