Shin Shirayuki-hime Densetsu Prétear, Harukanaru Toki no Naka de: Hachiyou Shou Recommendations
It is similar in the sense that the main character is being protected by several 'guardians' and that they have to stop an evil being.
Both are about a girl who is sucked into a world of supernatural (one, quite literally) and have to save the world. Also, both could be put under the reverse harem genre. O.o