"Let's meet at the place where it all began." The true plot is revealed as Takuru travels to the Hikariwo. There he eets the other person behind the series of brutal killings.  But a deeper mystery lurks in the background: what Serika is telling him doesn't make sense, and he's convinced that as horrible as the story is, there's more to it than even he knows.
Back then, you wished for
my existence to save your life.
أردتني أن أنقذ حياتك في تلك اللّحظة
Damals hast du dir von mir gewünscht,
dass ich dir das Leben rette.
Aquel día deseaste
que yo existiera para salvarte.
Aquel día deseaste
que yo existiera para salvarte.
Ce jour-là, tu m’as créée
pour sauver ton existence.
In quel momento
Você quis que eu salvasse a 
sua vida naquele momento.