Anime Version

The younger twin sister of Ton. Just like her sister, she is also loyal to her cousin Sōsō and is one of her commanders. Unlike her sister, she is more calm and an ingenuous person.

Visual Novel Version

The younger sister of the Kakō sisters and also Sōsō's cousin and a commander of the Gi kingdom. Unlike her sister, she is calm and very intelligent. In the first game she shows no signs of resent for Kazuto after being captured and treats him normally. In the sequel, Shin Koihime Musō, she has a normal friendly relationship towards Kazuto, and often asks him to bear with her older sister's odd behavior.

(wikipedia.org)