Japanese Health and Beauty Book 'Simple Introduction to Posture and Beauty'

This is a vintage Japanese health and beauty book, likely from the mid to late 20th century, given its artwork style. The cover depicts three stylized female figures, stacked vertically, with long, flowing hair rendered in vibrant, segmented rainbow colors (red, orange, yellow, green, blue, purple). Their skin tone is fair, and they are dressed in simple blue swimsuits or leotards. The artistic style has a distinctive, somewhat psychedelic or pop-art feel, common in the 1960s or 1970s. The background behind the figures is a mottled reddish-brown with circular motifs. The left side of the cover contains Japanese text, primarily in black, against a cream or off-white background, with some smaller red text providing additional information. The book appears to be a paperback, showing signs of shelf wear, including some minor scuffing and corner wear, consistent with its age and material (likely paper or thin cardstock cover). There are no overt tears or significant damage visible, but the edges show slight discoloration and handling marks. The spine is not visible, so its condition or binding type cannot be fully assessed. The craftsmanship suggests a mass-produced item, though the cover illustration itself is a notable feature, indicating a period where such bold, illustrative styles were popular for cover designs.