|Kanji Name||東 松原|
|Height and Weight||181 cm, 58 kg|
|School||Fujou High School|
|Class and Year||3-E|
|Anime|| Episode 6 (Cameo)
Episode 10 (Actual)
She has have a perfect value lesson, polite demeanor, and proficient in the field of sports, she is known as Perfect Girl. Later, she also known as Two Big Sis of Fujou with Kudanshita Kusshi who always take care her juniors.
- When childhood through to elementary school, is known that Matsubara had been friends with Shinsen, and Tama Sakai.
- Just like other characters' in D-Fragments series, their names are reference to railway stations in Japan. Her name is derived from Matsubara Station (Tokyo).