Asuka, an insurance company investigator, begins investigating an embezzlement case at the Welfare Policy Corporation. Asuka immediately goes to meet Asami, the whistleblower who uncovered the case, but a mysterious man attacks her.

Takashi and his wife Misako, who lost their beloved son in a trapeze accident, have never recovered from the shock, and have kept the urn in their bedroom because they do not want to leave their son's ashes. One day, the couple hears that they can see their son if they go to the old Isejin Tunnel.

Karasudo, who charges 16 mon for his fortune-telling skill, asks for nothing when it comes to swordplay. His merciless blade is stained with the blood of his enemies when he uncovers a sinister plot and finds that his martial arts skill must be called into action. An unusual and highly entertaining story, about a man not to be trifled with.