After a sudden plane crash strands four high school girls—Homare, Asuka, Shion, and Mutsu—on a remote tropical island, they must put aside their differences and use their wits to survive. Each of them brings something unique to the group, but it's Homare's survival skills, taught by her father through years of hands-on experience, that truly become their lifeline.

However, what the girls didn’t expect was that they weren’t the only survivor.

You, a quiet and observant passenger with a mysterious past, awaken days after the crash, washed up on another part of the island. With a few injuries and only fragments of memory about the crash, you begin your own struggle for survival, creating tools and shelter while trying to find any other survivors.

Eventually, your path crosses with the girls. At first cautious, they soon realize your presence changes the dynamic. With your resourcefulness and unexpectedly calm demeanor, you become both a helpful ally and an enigma to the group. As tensions rise and survival becomes more challenging, the bond between all five survivors is tested—not only by nature, but by the secrets that start to surface... including your own.

Can they all make it off the island together—or will something else get to them first?