Young Rena suffers from a social anxiety disorder. It keeps her from engaging at school, from hanging out with her best friend in person, or participating in any sort of group activity. Pressed by her mother to find some social outlet, she enrolls in a School for Ninjas-and in an instant, her life changes. Rena's instructor, the mysterious Dysart, tells her that her presence fulfills an ancient prophecy and that she will become the Ninja legend known as "The Ghost." Assuming she can even get past her own anxieties, will she help Dysart return the Ninja to their former glory, or is Dysart planning to exploit Rena for his own cryptic aims?
