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This series is very similiar to Love Hina. Maybe not as silly, but a bit more thoughtful.
If you liked Love Hina you'll love this one. It is in no way inferior to Love Hina concerning the muscle ache after watching a few eps....yes, laughing CAN be that exhausting :D.
Evangelion doesn't have anything to do with .hack//SIGN, but the story line is equally as good and philosophically valuable. ^_^
Very recommendable anime with similiar qualities as Love Hina.