Juna moves back home after months of training and fighting. Home things aren't any better. Her father left just after he left for Japan. When she comes back home now, she starts crying about those news.
A day later her father returns home to say hello. This awkward meeting makes things even worse. The meeting only enforces her bitterness.
What's even worse for Juna is that a Raja attacks her school. Her classmates ignore everything. So Juna and Chris must confront the being alone. But the big problem for Tokio and Juna is how they can leave the math class to fight.
On their mission to stop the Raja, Juna learns a lot of her math teachers past and not everything fits the profile of an average teacher.