one of the chou san shimai (3 chou sisters), who seems to be the one handling the money which is collected

Anime Version

Tenhō's youngest sister.

Visual Novel Version

The youngest sister of the Chō sisters. She and her sisters are a famous idol group and the leaders of the Yellow Turban Rebels in the sequel, Shin Koihime Musō. After being conquered by the Gi faction, she and her sisters join forces with them.

(wikipedia.org)