I was very fascinated by this anime. It's great, all through this first installment...the only problem is the other world that she ends up in. She is brought there by a mysterious man, 'Keiki', and his summoned beasts. The weird thing is that everything from this other world looks extremely cartoonish, and doesn't seem to fit. Once she enters that world, the animation is inconsistent. It resembles ancient China, and that all looks well. However, the way the beasts are done can leave you pretty skeptical at times. But--the story is really intriguing. Youko is well developed, and since she refuses to accept the world she has been dumped into, she grows slowly. The plot advances in every episode, and it's delightful to see Youko grudgingly drawing her blade (since you know she has to accept it sooner or later, apparently later). It's an unpredictable, exciting story.
My main problem is that randomly shoddy animation. I know the series is long and all, but they surely could've done a little better.