Wind, Cold, and Falling Rain

The moment he opened his eyes, he found himself in a blank space. An unidentified slime-shaped creature called itself the System and told him in a mechanical voice that he had to complete many stories here before he could return. His memories were so fragmented that he could barely remember anything. Only by following the System's instructions could he gradually recover his memories and find his way back.

After going through one story after another, he began to notice something was off. Every story had the same protagonist. As his memories continued to return, he also began to realize the truth about his situation...