Ren returns to the town of his childhood, Kaminohara. 
Strangely, Ren is unable to recall any memories of the town. 
Meanwhile, his smartphone installs a mysterious game called Monster Strike — heralding the start of a desperate battle!
-Really?
-Ready your smartphone!
- Ist das dein Ernst?
- Halte dein Smartphone hoch!
-¿Estás hablando en serio?
-¡Levanta tu teléfono!
- ¿En serio?
- ¡Prepara tu smartphone!
-É sério?
-Segure o smartphone para o alto!