Years after a major earthquake, which is said to have been caused by a rising and falling catfish under Japan, creates different zones in which time passes differently, Sora and her father secretly investigate the off-limit zones in order to find the answer behind the time anomalies and the disappearance of Sora’s mother. But one day her father begins to act strangely – his memory appears to be deteriorating. When he disappears, Sora has no choice but to venture down deep into the time zone to find her father and, perhaps, the catfish itself.