Contract from the Black Starry Sky

The boy wakes up in a new world. In this world, nightmare species, magic, and unknown weapons and tools are all so strange. Of course, the stranger included himself. "I'm sorry. I just want to live. Why is it so difficult?" Facing the endless pursuit in the future and the ubiquitous dangers (in various senses), he became a host and struggled to stay alive. But somewhere he didn't know, his every move was being observed.