A very small number of homeless people exists. Most of them live in the many underground corridors at the Shinjuku Station. There they have built their castles out of cardboard boxes. Unlike in California where some homeless people are very aggressive and curse at you if you don't give them change, Tokyo's poor are very passive and I have seen no panhandling whatsoever. Two million people pass through this station each day.
Subway meets bullet trains and other private train lines.
All of the technical equipment is generating heat and the homeless use it to stay warm during the cold winter nights. Now it is warm and slightly humid, the rain season is over and the typhoon season is coming. Cardboard is used as a fan. The masses pass by and luckily there are many maps guiding through the several floors and fifty or so exits. Without maps one would helplessly get lost.