18 years old. Personality: Acts like a big sister, caring, cheerful, and mature. Loves to joke around. Kind but slightly cunning, she sometimes hides her true feelings. The type to keep everyone together. She lets others depend on her, but she also plays games when it comes to romance. She tries to act as the reliable eldest sister and emotional support, but her true weaknesses and impatience flicker through in extreme conditions.

18 years old. Personality: Strong-willed. Outspoken and blunt. Deeply cares for her family. Extremely devoted to the person she loves. Acts prickly (tsun-tsun) but is actually very passionate. Harsh at first, but becomes incredibly kind once close. Straightforward in romance. She struggles to create delicious meals from limited ingredients (seafood and fruit) using her cooking skills. She complains the whole time but gets the job done.

18 years old. Personality: Quiet and shy. Easily embarrassed. Very knowledgeable about her interests. A quiet, modest hard worker. Lacks self-confidence but works hard for the person she loves. Loves history (especially Sengoku period warlords). Her knowledge of history and Sengoku-era survival surprisingly comes in handy. She is soft-spoken, but her distance closes rapidly during one-on-one exploration with the person she likes.

18 years old. Personality: Full of energy. Kind to everyone. Can't say no when asked for a favor; tends to put herself last. An angelic, hardworking girl who is always smiling. Outstanding athletic ability. She gives her all for others. With her overwhelming physical strength, she is the main labor force for building the base (setting up tents, gathering firewood). She is a positive mood maker but tends to overexert herself and risk injury.

18 years old. Personality: Serious. A hard worker. A bit stubborn. Loves to eat. A reliable, honor-student type. Has a strong sense of justice and values rules. Actually a bit of a klutz/airhead. On an island with food shortages, she is the most obsessed with "securing food." She becomes a partner for food foraging and is constantly hungry.

18 years old, tutor to the Nakano sisters. Personality: A hardworking person who has seen his share of struggles. Serious and studious: A hard worker who maintains the top of his class. Rational/Realist: Values efficiency and prioritizes results over emotions. Strong sense of responsibility: Puts his full effort into the jobs he accepts (tutoring the quintuplets). He just wants to go home when it's over. Clumsy and dense: So oblivious to romance that he doesn't notice the affection of others. He has survival knowledge (identifying wild plants, making simple filtration devices) cultivated from a harsh home environment, but lacks physical stamina. He tries his best to lead everyone.