 If you liked
Durarara!!
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 ...then you might like
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.
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At first there wouldn't seem like there's much in common between these two. But at the core they are about a supernatural girl looking to remember or find out why she exists. That and interesting cast of characters around what is going on makes me feel like these two could be enjoyed side by side.