Nana Komatsu is a small town girl who goes to Tokyo to follow her boyfriend and college friends, with the hope of having her dream life.
Black Stones, known as Blast (ブラスト, Burasuto) for short, is a punk rock band with Nana O. as the lead vocalist.
Due to their popularity, Nana O. sees them as her rival and wants Black Stones to overtake them in Japan.
As they are not deeply involved with the two bands, she will often reflect on her experiences with them for reassurance when she is in doubt of her simultaneous loyalties to Blast and Trapnest.
When Blast was becoming popular, they were given a leak that connected Nana O with Ren and have not stopped from spreading negative (and sometimes false) information about them.