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He read an article about Hayes - who brought the art of ninjutsu to America.

The Mie region includes the city of Iga, often referred to as the "home of ninja" because it had a famed school of ninjutsu - or ninja techniques.

The turtles learn ninjutsu from their adoptive father Splinter, a mutated rat, and fight crime.

"I thought we were just playing and didn't think I was learning ninjutsu," he says.

He says that when he dies, the deadly art of ninjutsu will die with him because it does not suit the modern age.