A bolt of lightning pierced the night sky, illuminating the dark sea. A dilapidated sailboat was teetering on the edge of the storm and nearly capsized. The crew panicked and tried to stabilize the ship, but a huge wave crashed and one sailor was swept overboard. The sailor struggled in the sea, his consciousness gradually blurred, and his body was swallowed by endless darkness. However, his will to survive drove him to struggle and swim toward the sea. After some hard work, he finally surfaced, but what greeted him was a desolate island...