 If you liked
Suzumiya Haruhi no Yuuutsu
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 ...then you might like
ChäoS;HEAd
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Tons of techno jabber with characters that have the power to change the world.
Both refer to different realities
and some of the main chars are a bit similar
both focus on a mc getting caught up into some strange events with an unusual type of girls along the way.
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Recommended by Disapeared_Ghost
Suzumiya Haruhi has definite Science Adventure Series vibes to it. Conceptually, it is pretty similar to ChäoS;HEAd, but the group dynamics and overall quality are more like Steins;Gate. Weird stuff happens for vaguely scientific reasons, and it would be spoily to get into details, but Suzumiya shares a lot of the mystery and philosophical aspects to ChäoS;HEAd.