Manga Help!!!!( magic knight Rayearth)?

i have the manga book of magic knight rayearth, and it just have the volumes 1-3. were fuu, umi, and hikaru become magic knights and defeat Zagato, and they also earn their magic knight powers, but in the end of volume three, they end up killing the prinncess who was actually in love with Zagato, then after that there back at tokyo and the final part of the volume was fuu, umi, and hikaru saying " it's not fair!!" abut my main question is is there more to the story of Magic knight rayearth? and are you a fan of this manga cause i'm a fan and has anyone seen the anime of this?