 If you liked
Tabi ni Deyou, Horobiyuku Sekai no Hate made
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 ...then you might like
Shoujo Shuumatsu Ryokou
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The mediums may be different, but both are adventure stories surrounding two characters traveling on journeys together in a hopeless, post-apocalyptic world. Both stories presenting a more optimistic tone to living in such desolate places valuing the remainder of time to enjoy living compared to giving up because of the state of their worlds.