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

1. Kenta Saito (Male): Calm, collected, and possessed of natural leadership qualities. He remains level-headed even in crises and tries to set realistic goals.
2. Misaki Suzuki (Female): Extremely caring and attentive to everyone. During survival, she naturally takes on the role of connecting people, such as tending to the injured and distributing food.
3. Haruto Takahashi (Male): A mood-maker whose strengths are physical stamina and cheerfulness. Good at livening up the atmosphere, though his occasional recklessness can chill the room.
4. Yui Tanaka (Female): Possesses extremely sharp powers of observation, noticing small changes and nuances in facial expressions. A cautious type who always questions hasty 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 backfire.
7. Ren Yamamoto (Male): A man of few words but high initiative, silently doing what needs to be done. Because he doesn't show emotion, it's hard to tell what he's thinking.
8. Sakura Nakamura (Female): Prone to anxiety and mentally fragile. She tends to cry when fear or stress accumulates, often requiring support from those around her.
9. Kaito Kobayashi (Male): Highly dexterous and skilled at crafting tools and repairs. A valuable asset in survival due to his talent for improvising with limited materials.
10. Yuna Kato (Female): Strong-willed and hates to lose. She holds firm opinions and speaks out against unfairness. She isn't afraid to take a leadership role.
11. Shota Yoshida (Male): Possesses a strong sense of justice and is proactive, though somewhat impulsive. He can't leave people in trouble alone and often rushes in regardless of danger.
12. Moe Yamada (Female): Quiet and a good listener. She rarely asserts herself but listens well to others, acting as a buffer to soften the atmosphere.
13. Tsubasa Sasaki (Male): A tactician who excels at situational judgment and forward-thinking proposals. 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 keeps her distance, but her observational skills are high.
15. Sota Inoue (Male): A cheerful glutton with an abnormal obsession with food. A mood-maker by nature, but he is weak to hunger and prone to irritability.
16. Chinatsu Kimura (Female): Attentive and suited for a coordinating role. Good at mediating between people and naturally steps in to arbitrate when conflict arises.
17. Takumi Hayashi (Male): Introverted and dislikes standing out, but highly knowledgeable. He possesses useful information in unexpected areas like botany and first aid.
18. Ayaka Saito (Female): Highly intuitive, judging things by feel rather than logic. She occasionally makes sharp points, but they are often doubted due to vague reasoning.
19. Yuma Shimizu (Male): Extremely serious with a strong sense of responsibility. He steadily performs assigned roles and hates cutting corners. His lack of flexibility is his one flaw.
20. Yuuna Yamaguchi (Female): A realist who knows how to navigate the world. She calmly assesses situations and naturally maneuvers to benefit herself and her allies. Can be seen as calculating.
21. Riku Abe (Male): Strong with high physical ability, often entrusted with heavy lifting or dangerous tasks. Simple-minded and a reliable presence who acts to complement others.
22. Hina Mori (Female): Kind and healing. 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 makes many biting remarks. He hits the nail on the head, but his poor delivery often damages his relationships, leading to isolation.
24. Mizuki Hashimoto (Female): Competitive and active. She has great stamina and doesn't mind working alongside the boys. Her emotions are close to the surface, and she heats up easily.