Visual Novel Version
A bespectacled officer and a new character in the sequel, Shin Koihime Musō. She's normally bookwormish but wishes to be more feminine. Kazuto helps her out by getting her to try on a dress.

Anime version
Unlike her scholarly counterpart, Ryomo is a warrior and serves in the personal guard under Kannei. She was eventually relived of her duties to be appointed as an apprentice strategist to Sonken, Princess of Wu, whom she appears to have developed a crush on during their time spent together.

(Source: Wikipedia)