 If you liked
Colorful (Movie)
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 ...then you might like
Aku no Hana
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Although they are quite different in plot, Aku no Hana and Colorful are similar in mood and atmosphere. While watching both of them you can feel a kind of tension. Both of them are psychological dramas with slice of life elements, where protagonists are in a normal everyday situatution first, and as the story goes on, they learn more and more about the dark side of the people around them, and also about themselves.
One of the main differences is that Colorful has also supernatural elements and is in general more optimistic than Aku no Hana.