Kunio Nagatani participation is credited as composition since the manga consists of the main story by Nagai and of several texts written by Nagatani related to the Kamasutra, not to the main story. Aikawa's grandson, Ryu, becomes involved when the mysterious cult attacking Ryu and his sassy girlfriend Yukari and ransacks his grandfather's apartment in search for information about the princess until Ryu witnessed as he discovered the manuscript which is actually was an ancient Indian sex manual called Kamasutra. So, Ryu goes to India to help his grandfather. There, he finds his grandfather's assistant, Shakti, who introduces him to learn the techniques which found in Kamasutra. However, as Ryu and Shakti flight towards to Prof. Aikawa locations, they are kidnapped by an ancient Indian cult, the Naga Tribe , who's also looking for the princess and takes them into the Palace of Naga. Ryu is sexually drained and physically debilitated while in captivity, but his grandfather and adventurous Indy Yakko manage to save them.