Neither speaks, much to the frustration of their noisy cousin, whose only concern is to avoid returning to school. Late in the movie, after much has been revealed, Naoki and Kozue do talk to each other, but in a bizarre, telepathic way. They are like children who ve developed their own language. Eureka features some splendid scenery, but it s not meant to be taken literally. The mountains, open fields, and the big sky are reflections of the characters inner state.
Noises are subjective, too.
Aoyama withholds sound at crucial transitions so that certain scenes end in complete silence. Other times, he ll amplify a background noise, like the sound of crickets, until it drowns out everything else. It all culminates in a scene near the end, when Naoki and Kozue are separated. Fully clothed, Naoki wanders fearlessly into the ocean. The sound of waves is deafening.