Saver, Fushigi Yuugi: Genbu Kaiden Recommendations
1. There is a heroine who is in love with someone she isn't supposed to
2. The heroine travels to a different world where they need someone to save the country from some evil people
3. The heroine is strong and has some way of fighting
4. Girl has to travel with a bunch of guys
5. Love triangle/square
6. Part of a prophecy
Both of these are adventures with strong willed heroines, but Fushigi Yuugi is better suited for a more mature audience. But if you couldn't get enough of either one you might want to try reading the other.