Kyuukyoku no Sex Adventure Kamasutra

When the Naga attack the Gupta kingdom in ancient India, Princess Surya disappears through a mysterious intervention. Centuries later, Dr. Aikawa discovers her frozen body in an ornate coffin in the Himalayas and brings her back to life with the help of his grandson Ryu.

Surya awakens to an unfamiliar world and a young man who resembles someone she lost long ago. Meanwhile, a present-day Naga leader seeks both the princess and a powerful relic associated with immortality, drawing an ancient conflict into the modern age.