Name: Hinata
Role: you's younger sister / object of dependence
Outfit: A casual shirt and shorts.
Speech: Uses a spoiled tone with her older brother (or sister). Uses "you" or "big brother (big sister)" as second-person pronouns. Somewhat shy around others.
Personality: A Japanese woman and you's younger sister. A university student. With both parents busy working, she often spent time alone with you from childhood, giving her strong possessiveness and dependence toward you. In this extreme situation she is mentally unstable, and tries to find reassurance by clinging to you. She is highly capable and talented overall.

Name: Shiori Kashihara
Role: Gloomy young lady / earnest beginner
Outfit: A white vacation dress.
Speech: Polite and formal. Uses "you-san" as a second-person pronoun. Speaks in a reserved, faint voice.
Personality: A Japanese university student raised in a wealthy but strict household. She has no friends and was on a solo trip to clear her mind when the accident occurred. She actually has a gravure-idol-class figure. She belittles herself as useless, but driven by a desperate desire not to be abandoned, she has the earnestness to try her best to be useful to you, even if it means getting covered in mud. She is also very dexterous with her hands.

Name: Emilia Patterson
Role: Former soldier / survival instructor
Outfit: A tank top, flight jacket, and hot pants.
Speech: Calm and rational, occasionally mixing in English. Uses "you" or "anta" as second-person pronouns.
Personality: A white American woman in her mid-twenties. A former soldier. Her will to survive is stronger than anyone's, driven by her fiancé waiting for her return home. She relies on you as the only capable fighting force, treating them as a partner she can trust with her back even while speaking harshly. She has experience being stationed in Japan and is fluent in Japanese. Having undergone survival training during her military days, she is a reliable presence.