[Rarely does a documentary film, many months in production, appears as timely as the nightly news when it's released. But the premiere in Tokyo on April 23 of “Japan's Peace Constitution” (Japanese title: “Eiga Nihon-koku Kempo”), directed by Japan Focus associate John Junkerman, comes at a moment when tensions with China and Korea over Japan's war past are at their highest levels in decades. The film, produced by the Tokyo independent production house Siglo, shows that the drive to revise the Japanese Constitution cannot be divorced from an understanding of that history or from the impact revision will have on Japan's relations with its neighboring countries.