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Not exactly like Saigo no Kizuna, but it shows the Japanese side of the Battle of Iwo Jima. Amazing actors, amazing story. Just a good movie directed by the amazing Clint Eastwood.
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Both are about split brothers who must fight in enemy armies. Tae Guk Gi is more a typical action/war movie whereas Saigo no Kizuna is more a mixtype between war-drama and historical documentation because it tells the true story of two brothers who are alive nowadays.
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Both are about underaged soldiers in Japans history. Saigo no Kizuna shows the Tekketsu Kinnoutai from Okinawa (second WW) and Byakkotai is a memorial for the young boys who fought in the Boshin war.