She's the main character of the story. Her grandfather is the leader of the Somei Yakuza group in Kansai. She started living in Tokyo due to her arranged marriage.

Yoshino is beautiful but despite that she receives criticisms about it, from "The hostess of Umeda" to "Mrs. Divorced with kids" and "Pretty face you get tired of in three days since middle school."

(Source: Raise wa Tanin ga Ii Wiki)