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...
My underwear fell off, 
so my life energy is fading!
Meine Unterhose ist runtergerutscht,
daher vergeht mein Leben!
¡Mi ropa interior se cayó
y pierdo energía vital!
¡Mi ropa interior se cayó
y pierdo energía vital!
Avec ma culotte descendue,
je m’affaiblis !
Mi sono cadute le mutande,
la mia energia sta svanendo!
Minhas cuecas caíram, então
minha vida está acabando.
Трусы слезли, мне осталось недолго!