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!
The secret's in the mystery of
their personality and background,
Wenn die Persönlichkeit
und der Hintergrund unbekannt sind,
El secreto está en el misterio
de sus personalidades y su pasado,
El misterio en el secreto
de su personalidad y su pasado,
Le secret réside dans 
le mystère de leur personnalité,
O segredo está no mistério da sua
personalidade e passado,