Just got to know this movie's existence last night.
Finished watching off youtube last night and it's great, brought tears to my eyes several times just like the anime did.
This movie was released in 2005 to commerate the 60th anniversary of WW2's end. Unlike the animation, the live action movie also tells the story from the 'wicked' auntie's POV, of why she did what she did to the siblings.
A highly recommended anti-war movie... and of course, there's Matsushima Nanako too.