 If you liked
Shinseiki Evangelion Movie: Air/Magokoro wo, Kimi ni
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 ...then you might like
Koroshiya 1 The Animation: Episode 0
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Both are anime about a crybaby with psychological problems that has a mental breakdown and explore hidden power. Both anime are dementia genre. Both have interesting, original plot and plot-twist. Both have also nicely done animation (while End of Evangelion has high quality animation in general, Koroshiya 1 has lower quality one, but it fits the anime perfectly). Both anime have gory and disturbing parts. If you liked one, you may like the other one.