Wow. There's isn't much I can write here. Fushigi Yuugi is one of my favorite manga series... I haven't seen the anime yet but heard it's good.
The basic story line is.. for you people who have never seen it before is two girls get sucked into a book where they must gather some senshi. If you want to know more checl out the episode spoilers.
Episode spoilers 1-52!
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See that guy in the background? Thats Tasuki. You stay away from him! He's mine!!!!