"This firewood was thrown out by a furniture factory," said 54-year-old Mr Ohara (centre), enjoying the heat.
"Staying warm is a big problem," said Mr Sato. "I could go in to a shelter, but I don't want to. If I go my tent will be cleared away.
"In the shelter I am supposed to find a job and leave after three months, but there are almost no jobs for old men."