On the way back from a school trip, a small chartered boat carrying 25 students and several chaperones was caught in an unexpected storm. The hull was damaged by violent waves and strong winds, and it eventually sank. The teachers went missing while trying to save the students. As a result, only the 25 students managed to cling to life jackets and debris, washing up on the sandy beach of a deserted island in the southern sea after drifting through the night.

1. Rinko Amano (Female) Calm and collected with good judgment, she is a natural leader. She stays level-headed even in crises and tries to set realistic goals.
2. Misaki Suzuki (Female) Extremely caring and attentive to everyone equally. During survival, she naturally takes on the role of connecting people, such as caring for the injured and distributing food.
3. Haruto Takahashi (Male) A mood maker whose strengths are physical stamina and cheerfulness. He is good at livening up the atmosphere, but sometimes his reckless actions make those around him uneasy.
4. Yui Tanaka (Female) Possesses extremely sharp observation skills, quickly noticing small changes and nuances in people's expressions. A cautious type who always questions easy decisions.
5. Daiki Ito (Male) Argumentative and fond of logic. He analyzes situations and speaks his mind clearly, but his harsh tone often invites resentment and sparks conflict.
6. Akari Watanabe (Female) An optimist who never loses her brightness regardless of the situation. While good at encouraging others, she struggles to face harsh realities, and her optimism can sometimes backfire.
7. Ren Yamamoto (Male) A man of few words but high action, silently doing what needs to be done. Since he doesn't show his emotions, it can be hard to tell what he is thinking.
8. Sakura Nakamura (Female) Prone to anxiety and mentally fragile. She tends to cry when fear or stress builds up, often requiring support from those around her.
9. Kaito Kobayashi (Male) Highly dexterous and skilled at making and repairing tools. He has a talent for improvising with limited materials, making him a valuable asset for survival.
10. Yuna Kato (Female) Strong-willed and hates to lose. She holds firm opinions and speaks out against unfairness. She is the type who doesn't mind taking leadership.
11. Shota Yoshida (Male) Possesses a strong sense of justice and is proactive, but somewhat reckless. He can't leave people in trouble alone and sometimes rushes in without considering the danger.
12. Moe Yamada (Female) Quiet and a good listener. She rarely asserts herself but listens well to others, acting as a buffer that softens the atmosphere.
13. Tsubasa Sasaki (Male) A tactician type who excels at judging situations and making forward-thinking proposals. He prioritizes rationality over emotion, which can make him seem cold.
14. Rin Matsumoto (Female) Cool and rarely shows emotion. She speaks only the bare minimum and maintains a constant distance, but her observational skills are high.
15. Sota Inoue (Male) A cheerful glutton who is abnormally obsessed with food. He is a mood maker but is weak to hunger and prone to irritability.
16. Chinatsu Kimura (Female) Attentive and suited for a coordinating role. She is good at mediating between people and naturally steps in when conflict seems likely.
17. Takumi Hayashi (Male) Introverted and dislikes standing out, but very knowledgeable. He possesses useful information in unexpected areas, such as plants and first aid.
18. Kanako Shinozawa (Female) Cool and usually calm, a woman of few words. She is skilled in Kendo, Karate, Judo, and Aikido.
19. Yuma Shimizu (Male) Very serious with a strong sense of responsibility. He steadily carries out assigned roles and hates cutting corners. His lack of flexibility is his one flaw.
20. Yuina Yamaguchi (Female) A realist who is good at navigating social situations. She calmly assesses the situation and naturally positions herself to benefit herself and her allies. Sometimes seen as calculating.
21. Riku Abe (Male) Strong and physically capable, often entrusted with heavy labor or dangerous tasks. Simple-minded and a reliable presence who acts to complement the group.
22. Hina Mori (Female) Kind and has a healing presence. She dislikes conflict and loud voices, always striving to remain gentle. She calms the hearts of those pushed to their mental limits.
23. Aoi Ikeda (Male) A cynic who often makes biting remarks. He hits the nail on the head, but his poor delivery often damages his relationships, leading to isolation.
24. Satoko Imai (Female) Competitive and active. She has good stamina and doesn't mind working alongside the boys. Her emotions are easily visible, and she tends to get heated quickly.