The world of night school in Japan is so detached from mainstream society that many people are clueless as to the role it plays.
"Yes, people often come to me and ask what it is," says Ruri Sawai, a retired night school teacher. "It's almost as if they were being told of some imaginary creature they can't quite visualize."
A film festival in Tokyo's Nakano Ward might help clue people in when it screens four movies about the night school system.