 If you liked
Ihatov Gensou: Kenji no Haru
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 ...then you might like
Penguin's Memory: Shiawase Monogatari
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Both are excellent movies that deal with animal main characters who only want peace after their times of serving in the war. They are both very contemplative in their themes and heavily focus on both people and nature. Both are very peaceful movies that have a very strong hold on realism, and both contain surrealistic elements. Would definitely recommend one if you've liked the other!