Edoropolis is home to a variety of mechanical animals coexisting in perfect harmony. However, Lord Wanko becomes apprehensive when he unearths Lord Korn's treacherous plan to overthrow the shogun. To maintain peace in the city, Wanko introduces the Nyankees, an exceptional team of ninjas led by Yattarou, armed with the powerful Masamasa blade. The Nyankees seem invincible, facing every challenge head-on. But the team encounters another obstacle, other than foiling Korn's wicked scheme. They have to carry out their top-secret missions from the Pizza Cats restaurant while also serving scrumptious pizzas and dispensing justice.