It's always exasperating to see a person accused of a crime he did not commit. So when a courtroom drama like I Just Didn't Do It, the latest film from renowned Japanese director Masayuki Suo, delivers such a powerful critique of the Japanese legal system, audiences are sure to be left seething. This gritty social drama revolves around hapless commuter Teppei Kaneko (brilliantly portrayed by Ryo Kase) who is mistaken for a chikan, or groper, by a schoolgirl on a crowded train. With a 99.9 per cent conviction rate for this sort of assault, his lawyer and the police want Kaneko to sign a confession. But Kaneko would rather face prison, while he tries to clear his name, than admit guilt to win his release. Japan's legal system, where convictions are sought at all costs to ensure efficiency, has long been a blot on the reputation of an otherwise civilised and advanced country. While the west presumes a defendant innocent until proven guilty, the reverse applies in Japan. The film manages to explain complex legal concepts in simple terms, making the audience even more indignant when they learn about Kaneko's fate. When the verdict is handed down, it's hard not to wonder whether there's more emphasis on lowering crime rates than justice.