Prequel to Crazy Knife: Fighting in the Hanging Lake

The common man is not guilty, but he is guilty of carrying a jade! It's like a castle on a hanging lake in the land of peach blossoms, but because someone covets the Demon King's secret treasure, there is a disaster of bloodshed. After the nest is overturned, will the eggs be intact? This book tells about the events before the main story, just for my own entertainment.