 If you liked
Shoujo Shuumatsu Ryokou
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 ...then you might like
Owari Nochi, Asanagi-kurashi.
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Both are post-apocalyptic manga about young characters trying to survive. They both feature cutesy characters. One is much grittier and more philosophical, the other is much more lighthearted with some slight dark undertones, but both provide interesting looks at this kind of setting. Shoujo Shuumatsu Ryokou is much more thought out and well done, but if you enjoyed one you might like the other.