Two men have been called "the last ninja." The first is Fujita Seiko, who lived over a hundred years ago. Introducing himself as the last ninja, he held demonstrations throughout Japan and researched ninja arts. Going over footage of Fujita, we discuss the principles he taught. The second is Kawakami Jinichi, who is still alive today. We introduce the training he's continued for over sixty years and scientifically analyze a ninja breathing technique called "okinaga" to determine its effect.

The Tokyo area is one of the most densely populated places on the planet. Very small properties have long been a feature of the urban landscape, but many modern "kyosho jutaku" showcase the expertise with which architects satisfy the requests of future owners. We join architect Koshima Yusuke as he visits these tiny houses, and sees for himself the clever ideas that are used to create a cozy living space. This time, a house with an unusual living room—it hasn't got a roof!