Koike Kiyomi is a 16-year-old girl. She has all these different emotions intertwined in her mind. One day, she suddenly blurts out "What is a woman?" She then hears a DJ's voice in her head. The voice states "Women's Songs! Radio FM999 starts." The DJ in Kiyomi’s head proceeds to spin songs that matches her worries. With her eyes closed, Kiyomi meets various women in the world of music and learns from them. After school one day, while in her classroom, Kiyomi feels nervous about her future. She blurts out "What is a woman?" She hears the DJ's voice and FM999 begins. When Kiyomi returns to reality, she meets senior student Shinkai, who becomes a big influence on her future.