As the members of the Mutoh family go about their daily lives, a series of powerful earthquakes begins wreaking mass destruction throughout Japan.

Tragedy strikes, but the survivors continue making their way westward. Kite, a popular Estonian YouTuber, decides to join the group.

The Japanese archipelago begins to sink. The group escapes aboard a fishing vessel, but they're forced into the lifeboats after it's damaged.

Onodera's data contains a map showing that parts of Japan may resurface. For the survivors, rescue hinges on reconnecting to Kite's internet balloon.