Matsuoka (松岡,Matsuoka) was the older sister of Yuki Matsuoka. She often went out clubbing dressed in flashy clothing. Her favorite club was Joliana. On one occasion, she helped her sister and Tsukushi Makino dress for a party. She took them out dancing on another occasion.
Matsuoka was the first daughter born to her mother and father. She had a younger sister named Yuki.
One night, she came home and greeted Tsukushi Makino, Yuki's friend whom she had not seen for a while. Yuki then explained that they needed outfits for a party. She dressed them in the style she wore to her favorite club, Joliana. Yuki's sister also advised them to do a "octopus dance", which she called "sexy." Another night, she invited Yuki and Tsukushi to Joliana when she noticed the latter was down. There she wanted to dance on the platform and decided to take on Sakurako Sanjo. She quickly knocked Yuki's sister off the platform. Yuki then rushed to her sister's side. Several months later, she started wearing less make-up. Tsukushi visited the Matsuokas around the same time for dinner and to spend the night.
She had extremely long, curly hair that went halfway down her back. Yuki's sister wore a lot of makeup, jewelry, and garish clothing when she went out clubbing. Once everything was removed, she had a surprisingly plain face that even Tsukushi did not recognize at first. She eventually started wearing less make-up.
Personality and traits
Despite being a bit silly, she was a helpful and caring older sister to Yuki. She enjoyed having fun foremost and did so by going out clubbing. Yuki's sister was familiar with clubs, particularly Joliana. She liked to show off her dancing skills and frequently did so on Joliana's platform.