Against the backdrop of the Edo treasury devaluing currency and driving many into poverty, Hanzo Itami enforces the law without regard to status. He shows inadequate respect to the treasurer, who wants him dead.

Fearless Edo-period police inspector Hanzo Itami, nicknamed The Razor, has developed his own unique way of extracting information for his inquiries. His first adventure sees him investigating his superior officer's mistress, whom he suspects of having ties with a reputed criminal on the loose.

Hanzo extracts a confession from a ghost using his assaulting methods, foils thieves, connects with Heisuke Takei a friend from his youth, offers protection to a forward-thinking physician Genan Sugino who has defamed his ruler, discovers a pleasure ring of young wives and a blind music teacher, and cuckolds a corrupt official under his very nose.