The stage is five years after "Borderless", Nao, Kiri, and Kotone have started a new life on their own. One day, a novel written by Kiri will be published under the name of a popular young actress. Kiri is dissatisfied but cannot resist. In addition, "incidents" occur to trace the incidents in the works. They can't believe it's a coincidence, who imitated what and why? As they tried to get to the bottom of the truth, an inescapable tragedy struck them again...
Three siblings share a home with their parents living a happy life. The oldest one is good-looking guy, which is something of a contrast from his younger brother who is at school. The youngest one is the girl and has two brothers to protect her. And then there is Sakura, the family's dog who is always by their side. The fate of this quirky but happy family changes drastically after Hajime, the family's hero-like figure, encounters a tragic accident...
Dancing, singing, playing musical instruments, acting, modelling, writing-- Kobayashi Yui is a person of many talents. But hidden from our sight is the amount of effort she has put into perfecting each of these skills. As she continues to set new goals for herself and strives to become better, she has grown into her role as a pillar of the group. "Saitama Mad Dog" is what fans call her for her sadistic nature on stage, but behind the scenes there is no doubt that she is one of the core members who leads the group onward. Yui is currently an exclusive model for "with" magazine and has had several acting roles. She was given the nickname "Pon Pon" on Keyakitte, a nickname she repeatedly asked everyone to stop using, but of course it backfired…
