 If you liked
Higurashi no Naku Koro ni
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 ...then you might like
Mawaru Penguindrum
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Both are mindscrewing have deep plot and mystery, involve fate, have comedy moments and cute characters, if you like the atmosphere of mawaru penguin drum or higurashi no naku koro ni and want to watch something that leaves you wondering whats happening , im sure you're going to enjoy both higurashi no naku koro ni (all the seasons) or mawaru penguin drum.
Both are (well, Higurashi was) part of the dementia genre, with confusing plot, insane characters, dealing with a cruel fate, conspiracy... with bright colors and moments of adorableness to balance. Penguindrum is also similar to Kai, but put in a different recommendation because of spoilers.