After miraculously surviving a plane crash, four high school girls, Homare Onishima, Asuka Suzumori, Mutsu Amatani and Shion Kujou head towards a remote island for safety.
As Asuka struggles to prove herself useful to the others, Homare creates a makeshift shower. Later, Mutsu helps Homare search the shore for edible shellfish.
Needing food to stave them off until their trap catches something, Homare and Asuka dive underwater to search for turban shells. When Shion becomes downhearted after she thought she saw a ship, Homare asks her to help her dig up buried fish for a barbecue party to cheer everyone up. Later, Asuka and Mutsu discover that their trap has caught something.
Asuka and Mutsu go to check the trap they set. Just as they'd hoped, there's a rabbit caught in the trap, but there's no time to call in the reliable Homare. If they leave it, it might get away. What will they choose to do for the sake of survival?
Homare decides to take Mutsu with her to explore the island. The next day, as the girls find some tools in a broken down house, Homare discovers what appears to be smoke coming from somewhere.
The smoke turns out to be steam from a hot spring, which the girls immediately decide to soak in. The next day, Homare asks the others to help her retrieve some rope from the bottom of a ravine. When a thunderstorm appears, the girls take measures to protect themselves from the lightning.
Worried about UV rays, the girls try various sunblock alternatives made from squid ink, liver, and seaweed. Later, Homare tries to use more advice she learned from her father, with varying success among the other girls.
After using some washed up bamboo to build a roof, the girls discover a beehive nearby. Despite the excessive amount of bees, Homare puts herself at risk to retrieve some honeycomb to extract honey from. Later, Shion tries to prove her worth by fishing on a raft.
As Homare and Shion start to suffer from dehydration on their way back to the island, they are forced to take drastic measures in order to replenish their moisture.
