After Schneider was sent back to his hometown, the four turtles, who were once as close as brothers, no longer wanted to fight together as before because they had no enemies. Instead, they each delved into their favorite fields. The Ninja Turtles, who used to act together, became four lone rangers! At this time, a series of strange things happened in New York City. It turned out that the industrialist Maximilian J. Wittes intended to conquer New York City and secretly cultivated an army of ancient monsters. Together with the notorious ninja organization FootClan, various dark forces were ready to move in the corners of the city! The turtles are in a state of preparation for war again! They have united again and are ready to attack the dark forces!