 If you liked
Mirai Nikki (TV)
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 ...then you might like
Sankarea
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There is an abnormal and obsessive love for someone, in Mirai Nikki Yuno for Yukki and in Sankarea the father of Rea for her, you will think that kind of love is not normal in both anime, if you want to see a crazy and obsessive love I recommend both.
Mirai Nikki is higher in that and darker and Sankarea has dark setting too but with more comedy and romance.