 If you liked
Tsubasa: RESERVoir CHRoNiCLE
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 ...then you might like
Hatenkou Yuugi
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A little spoilerish to say why, but Hatenkou Yuugi goes about all of it's mind blowing psychedelics in a slice-of-life kind of way, while Tsubasa gets pretty intense... Lots of things in one manga occurs in the other one (you just have to get a good chunk into each of them to get to the good stuff!)