The story takes place in the modern world. The focus is on the members of the ancient Japanese Tavara clan. Many years ago, they were elite ninjas, but a tragic incident led them to erase their history from memory. However, when the country is on the brink of a major crisis, the lives of the heroes change. They must come to terms with their past and become the last ninjas in modern-day Japan... Welcome to the House of Ninjas.