Sonshoukou

Anime version
The youngest sister of the Son family and a princess of Wu. She is a spoiled brat who enjoys expensive things and tends to complain a lot. She joins Aisha's group after she runs way from home, bored of doing her royal duties, and later returns home. She also has a rivalry with Rinrin.

Visual Novel Version
She charges out of the kingdom to fight against the Hongo Faction who are falsely accused for betraying the Go faction. After being captured by Hongo Faction and clearing up the misunderstanding, she takes a liking to Kazuto and enjoys playing around with him.

(Source: Wikipedia)