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!
Summon me, and you'll have
a chance at getting out alive.
Wählst du mich,
hast du die Chance, zu gewinnen.
Si me eliges, tendrás la oportunidad
de ganar.
Si me eliges,
tendrás una oportunidad de salir vivo.
Appelle-moi, et tu auras 
une chance de rester en vie.
Se me escolher,
terá uma chance de vencer.