 If you liked
Mahou Shoujo Madoka★Magica
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 ...then you might like
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.
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Both anime has a very bitter sweet ending leaning towards the bitter side. lets just leave it at that.
As well both animes are relatively short so it wont really take up a huge chuck of your time. As well since both animes are rather short, you will get episode after episode of intense action.