When he was young, Kuro could see things that ordinary people couldn't. After being taken to the hospital, he pretends that he can't see anything so that his family won't worry about him. However, the things remain visible even after years pass. Furthermore, Kuro begins coughing up sand and can no longer eat. Desperately clutching at straws, he visits a certain place...
Their world is even more unfathomable 
and unknown than outer space.
.عالمها لا يسبر غوره ومجهول أكثر من الفضاء الخارجيّ
Ihre Welt ist noch tiefgründiger
und unbekannter als der Weltraum.
Su mundo es aún más inexplorado
y desconocido que el espacio exterior.
Su mundo es aún más inexplorado
y desconocido que el espacio exterior.
C’est un monde à part entière,
un vaste univers encore inconnu.
Il loro mondo è ancora più imperscrutabile 
e sconosciuto dello spazio.
Seu mundo é mais inatingível e
desconhecido do que o espaço sideral.
Подводный мир куда более
загадочный и неизведанный, чем космос.