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!
Maybe I don't have
to remember everything.
Vielleicht muss ich mich
gar nicht an alles erinnern.
Quizá no tenga que recordar todo.
A lo mejor no debería acordarme de todo.
Je n’ai peut-être pas 
à me souvenir de tout.
Talvez eu não precise
me lembrar de tudo.