The history of Okinawa Japan Tattoo Culture is rich with asian heritage... - and the tattoos protected Japanese women from pirates who sailed their trade along the beaches and prefecture shores.
The traditional tattoo HAJITI okinawa. To the back of the hand of woman
入れ墨 - Wikipedia
～ハジチのある風景～比嘉清眞写真展 : 那覇市歴史博物館
The Ainu and Their Culture: A Critical Twenty-First Century Assessment | The Asia-Pacific Journal: Japan Focus
Hajichi of Okinawa. Back in the older days of Okinawa, women used sharpened bamboo as a needle to get tattoos on their arms and hands as a magical charm that would word off evil, bring happiness or preserve a woman’s chastity. It is said that a woman was to value her Hajichi over wealth, her husband and life itself. They were commonly tattooed onto a girl's hands and arms when she came of age or during preparations for marriage.