After the male protagonist was hunted down, he brought 13 people and a seriously injured and unconscious female protagonist to a stream. It was probably because they were escaping from the pursuit of an organization that was lurking near the stream. The male protagonist realized that they needed to use this stream to avoid the pursuers and bring the female protagonist with them so that she could stay awake. Around the stream, they found many mysterious signs and hidden treasures, which aroused the interest and curiosity of the male protagonist. In this mysterious environment, they experienced many thrilling adventures and tests, and at the same time, they discovered the truth and wishes deep in their hearts.