Sora wa Akai Kawa no Hotori, Saver Recommendations
girl travels to another world/time...
girl is important in that other world/time...
girl becomes powerful warrior...
and many more similarities...If you liked Saver than i would definitely recommend Red River
Both are about two girls who get transported back into Ancient Europe and must fight a war to get what they wish for; both have romance for the main character, though Saver a little less so. Still, they're both really good, and all the while I read Red River I kept thinking of Saver.
So Lena and Yuri.
Both go back in time.
Both fall in love with royalty.
Both are really badass in war
Both are really smart
Both have loyal companions
Both stay in the past (in the end)