Wakaba Himekawa is aware that she is growing up more slowly than other people, but otherwise lives a peaceful life. On the same day that she finally gets her first period, her childhood friend Takaya confesses that he loves her. While Wakaba had never felt that way for her friend before, she is still happy, if confused. As she is about to answer Takaya's confession, an alarm suddenly sounds, and a broadcast begins that will change her everyday life.

From the mangaka of Pupa comes a tale from the world of Young Champion the Magazine that brought us Battle Royale, Tohai, Wolf Guy, Sundome and Young Black Jack!