 If you liked
Cat Shit One
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 ...then you might like
Penguin's Memory: Shiawase Monogatari
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Althrought made differently, both share same, fairly uncommon theme: otherwise cute animals taking part in armed conflict (Bunnies in Cat Shit One, Penguins in Penguin's Memory: Shiawase Monogatari), so there big chance that if you liked one, you´ll like another. While Cat Shit One is more action, Penguin's Memory is more drama.