Manga Hunter here. I admit that this recommendation is something I never played personally, but I read the story routes, so I get the basic gist of it. This is a visual novel, so it is a game and if it ever does get licensed or translated into English, I am sure to play it.
Sangoku Rensenki ~Otome no Heihou!~ by: Daisy2
(image from the Visual Novel Database)
Yamada Hana is just an average student. One day, when she reads a book about the Romance of Three Kingdoms, she is suddenly surrounded by a flash of light and she loses consciousness… When she wakes up, she finds herself in a forest. A man appears in front of her, and she is at a loss of what to do. The man’s name is Koumei and she meets another person called Gentoku, but she is mistaken for a disciple of Koumei’s and ordered to command an army and take part in a battle… She doesn’t know what to do, but somehow she wins the battle…
(summary from the Visual Novel Database)
I only read the story routes and the summary and I have to admit that I enjoyed it very much to the point I wanted to play it (too bad it’s not in English). This has a girl travel to the past of the Three Kingdoms and gives off a little of a Fushigi Yuugi feel with the girl being a little smarter. This was made into a manga, but it is not completed translated, but I will recommend it as well, since it was a pretty good read, but I do hope for more translations.
If you want the story arcs’ summaries then click on the picture below. Just remember that these are not by me, so show the one who made the summaries the support.
(image from Love-Colored Sky)
Sangoku Rensenki – Otome no Heihou! By: Daisy2 & Azu Maya
(image from Baka-Updates)
Yamada Hana, a high school girl, woke up and found herself in a strange land after being enveloped by a bright light that came out from a mysterious book. There, Hana met a young man named Gentoku, and ended up staying with him and his army as “Koumei’s disciple”…
(summary from Iskultrip Scans)
As mentioned, this manga is based off of a visual novel of the same name. I just really hope there are more translations.
Those are my recommendations, so as always please support the creators of these works and the translators when you can.