Are You Lost?

Four high school girls are stranded on a deserted island after a tragic accident during their class trip. As they introduce themselves, one girl, Onishima Homare, reveals an unsettling secret—she has been in this situation before.

Seeking water, the girls venture across the island, with Homare and Asuka discovering a dry stream bed where they attempt an unconventional method to extract moisture. Meanwhile, Shion and Mutsu, weakened by dehydration and left behind on the beach, share a heartfelt promise.

Homare and Asuka venture into the forest in search of food, where Asuka discovers a plant resembling taro and becomes excited. Homare warns it may be dangerous, but when Asuka throws a tantrum, Homare, frustrated, suggests testing its edibility and unexpectedly pulls up Asuka's skirt in the process.

Homare and the others discover signs of squirrels and rabbits on the island and set out to build traps using available materials. After some effort, they successfully create a working trap, which Asuka playfully tests with unexpected results.

Homare and Asuka go diving to collect food, using a makeshift method to see clearly underwater as they search for turban shells and oysters. As the harsh conditions wear on them, both mentally and physically, Homare recalls a lesson from her father: "When things are tough, when you’re sad, have a barbecue.

Asuka and Mutsu arrive at a trap they set and find a rabbit caught inside, but they are unable to contact Homare for help. They must decide whether to try to handle the situation themselves or risk the rabbit escaping.

Homare and the others decide to explore the island to better prepare for a prolonged stay and come across what appears to be a house. Though initially hopeful, they find it to be the ruins of an abandoned building. Amid the others' discouragement, Homare discovers an essential item that could aid their survival.

While exploring the beach, the four girls notice a column of smoke and rush toward it, hoping to find other people. Instead, they discover a hot spring, where they relax and rejuvenate after their journey.

Homare uses the squid and seaweed she brought back to create sunblock, helping others protect themselves from the summer sun. As challenges like bug bites and sweat test their endurance, she draws strength from the lessons her father taught her.

The girls track honey bees to their hive and attempt to harvest honey, despite the risks of bee stings. Meanwhile, Shion tries fishing from a raft but encounters unexpected difficulties.

After Shion is carried away by a dangerous rip current, Homare defies her father's strict rule of prioritizing one's own life and constructs a new raft to search for her. Despite her efforts, she struggles to locate Shion in the open ocean until she recalls one of her father's lessons.

Homare locates the isolated island where Shion was stranded and the two are reunited. Struggling with a lack of clean water and food, they face the threat of dehydration and must resort to a hidden method to survive.