Librarian Lin Ye suffers from face blindness, but received a wordless black book "Sequence" at midnight. Whenever someone dies mysteriously, clues written in blood will appear in the book. In order to survive, he was forced to take a magical potion and enter a mysterious world. In this era where steam and Cthulhu are intertwined, he not only has to face out-of-control monsters, but also uncovers the curse of reincarnation as an "observer" - because the ancient gods deep in the starry sky are waiting for him to write the final ending.
