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!
Humph. I know I do too.
Aber ich erinnere mich.
Pero sé que tengo recuerdos.
Pero sé que yo también.
Mais je sais
Mas eu sei que sim.