"Are You Lost?" centers on four high school girls who find themselves stranded in a remote location after a plane crash during a school trip. The group consists of Homare Onishima, a survival expert trained by her father; Asuka Suzumori, a cheerful and resourceful girl; Mutsu Amatani, a shy and reserved classmate; and Shion Kujou, a wealthy and somewhat spoiled student. Each character brings distinct skills and personalities to the group, which becomes crucial as they navigate their dire circumstances.

Homare, the de facto leader, uses her extensive survival knowledge to guide the others. She teaches them essential skills such as finding food, purifying water, building shelters, and avoiding dangerous wildlife. Her pragmatic and no-nonsense approach often clashes with the others' inexperience, creating moments of tension and growth. Asuka’s optimism and adaptability complement Homare’s expertise, while Mutsu’s quiet determination and Shion’s gradual development from helplessness to self-reliance add depth to the group dynamics.

The narrative progresses as the girls face a series of challenges, from harsh weather conditions to encounters with wild animals. Each chapter often focuses on a specific survival scenario, blending practical advice with character-driven storytelling. The series emphasizes teamwork and resilience, showcasing how the girls learn to rely on one another despite their differences. While the primary focus is on survival, the story also explores themes of friendship, personal growth, and the psychological toll of isolation.

The setting shifts between various environments, including dense forests, deserts, and islands, each presenting unique obstacles. The manga balances survival tactics with moments of humor and camaraderie, providing a mix of tension and levity. Through their journey, the girls not only learn to survive but also gain a deeper understanding of themselves and each other, making "Are You Lost?" a compelling exploration of human endurance and cooperation.