 If you liked
Suzumiya Haruhi no Yuuutsu
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 ...then you might like
Mirai no Mirai
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Both settings are considerably different but a key part of both series is that the main character is lead by a future version of someone that he knows and that guides him in order to not to ruin their future. Mirai in the case of Mirai no Mirai and Mikuru in the case of Suzumiya Haruhi no Yuuutsu, in both they also travel to the past and know past versions of people they know too, without them noticing in the future yet still having influenced in them and changing the protagonist's perception on those people.