Sengoku Joshikousei: Ryuu to Tora

Ryuu Uesugi and Torako Takeda are high school girls with memories of warlords. They have memories of Kenshin Uesugi and Shingen Takeda, who were sworn enemies in the Sengoku era—or perhaps it is because they have memories of them that they are attracted to each other. This is a beautiful and hard-hitting girls love story, with old-fashioned expressions and behavior that aren't unusual for high school girls, but exquisitely refreshing.

(Source: Takeshobo, translated)