"Wow, the weather turned bad quickly, huh?"
Filmmaker Eiji Han Shimizu is looking out at the narrow street from the safety of a Shibuya cafe. A storm is approaching. In spite of that, there's a little smile on his face.
One could argue that the smile is just there because Shimizu is promoting his new film. He in turn would argue that the smile is there because he has spent six years researching the causes of happiness. The result of all that work is the documentary feature "Happy," which will open in Tokyo on May 12 and in theaters around the country after that.