Irezumi (1984)

To satisfy her lovers fetish for tattooed women Akane agrees to have her body covered in eloborate tattoos by Kyogoro an old craftsman Kyogoro has developed a special technique by which his assistant Harutsune keeps Katsukos mind off the pain while Kyogoro does his work After the work is done Harutsune makes the shocking discovery of how Kyogoro mastered his technique