Matsuo Hasumi

 (松尾羽純) is a former talento, former Japanese idol and a former member of All Nighters and its subgroup Okawari Sisters.

She joined All Night Fuji in 1983, and joined the idol sub-unit Okawari Sisters on February 21st, 1984. She stayed until it disbanded on March 31st, 1985.

After breakup she retired from her idol career and began working an office job at her old record company, For Life Music. She later married the company's president in 1988.

Trivia

 * During the August 1984 "All Night Fuji Special Concert" where the Okawari Sisters made their live debut, Matsuo became emotional and suddenly blurted out "Minna, daisuki! (みんな 大好き/I love you, everyone!)" during the encore performance of one of their song's instrumental breaks. This became a highly talked about occurrence that was parodied on several TV shows and news outlets. In subsequent years idols expressing gratitude towards their fans during instrumental breaks became commonplace, but this is said to be the first documented time it occurred.
 * She often wore glasses when appearing on All Night Fuji and in some promotional photography, which was quite rare for idols of the Showa era.