Several high-school friends spend their final summer together indulging in sex and leisure; their halcyon days are soon coming to an end.
A young girl named Mitsuki receives a ticket for a bus tour from her uncle. The tour appears to be normal (expect that everyone appears to be quite sombre), but Mitsuki learns its true purpose: the other passengers and the tour manager have a suicide pact to send the bus over a cliff so their families can collect the insurance money.
In the year 2011 the greatest tectonic disaster in the history of mankind has occurred. As a result of the catastrophic earthquakes North and South America, Eurasia, Africa and Australia have sunken underwater while the Japanese islands remain untouched.
