Before Tsubasa Ozora moved to the city of Nankatsu, Yayoi was his first and only friend. Later, she moved to another school and became the manager of FC Musashi. Yayoi really cared about Misugi, Musashi's captain, since he had a heart disease and playing soccer could endanger his life. Thanks to Yayoi's concern and 2 years of rehabilitation, Misugi could play again in his last year of middle school. They also started their romantic relationship after that.