Doesn't matter if you haven't seen it, please try to read it some time then maybe sometime look at watching it. In veiwing the manga you will find out more than the 103 Episodes there are of the series. The creator of this manga has put alot of work into each of the characters and the background. Please when ever you get the chance read the manga as far as you desire then decide if you both watching the series. The series however shows a great amount of colour in each scene it is simply amazing, but that is just my opinion. I also see it as a stepping stone for other anime/manga. Over all it is a great series. I highly recommend you give it a read/watch when you can.