 If you liked
Kamisama no Inai Nichiyoubi
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 ...then you might like
Shoujo Shuumatsu Ryokou
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Both are the story at the end of the world.. While one is in realistic side and another is in fantasy side, you can feel the same atmosphere like solemnness in both animes..
Finding hope and beauty in a dying world - that's the main theme of these two series. In Girls' Last Tour, Chito and Yuuri only have each other, but that's enough to make each day worth living, and in Sunday Without God, Ai embarks on a journey to save the world and helps all her new friends along the way. The world may be ending, but in both series the protagonists have those they care about, and there are still miracles to be found on their journeys.