[2] She then attended Shimizugaoka High School in Kure, Hiroshima due to her father's transferring from JMSDF Kanoya Air Base to JMSDF Kure Naval Base while in the Japan Maritime Self-Defense Force.
Because she had already graduated from high school, she was senior to most of the other members of Onyanko Club and became the de facto leader of the group.
Kokushō continued to stand out as a leader of the group, however, even with publicity surrounding the solo debut of fellow member Sonoko Kawai.
Kokushō then had to determine whether she wanted to continue as a member of Onyanko Club or begin a solo career and leave the group.
She made her solo debut on February 1, 1986 with the single "Valentine Kiss", which was backed by Onyanko Club.
From November 2008 onwards, Kokushō has made sporadic appearances for professional wrestling promotion Oz Academy, working as the manager of the villainous Ozaki-gun alliance.