Everyone around Futaba expects her to grow up and become an adult, and she's lost the ability to keep herself mentally balanced. At the bottom of her heart, her childish self is still there, and still strong. One day she wanders into another dimension, a world where the light has been lost, and darkness rules. The people there exist as babies wearing only their underpants...
Wait, is that the assassin 
you were talking about?
Moment mal, ist das der Meuchelmörder,
von dem du gesprochen hast?
Espera, ¿ese es el asesino
del que hablabas?
Espera, ¿ese es el asesino
del que hablabas?
Attends, c’est lui
que t’appelles « le tueur » ?
Aspetta, quello sarebbe
l'assassino di cui mi parlavi?
Espere, aquele é o assassino
que você estava falando?
Значит, это его ты ассасином назвал?