Rena and Yuko, the two sexually-adventurous high school girl friends from Pink Tush Girl (1978) get part-time jobs at a hostess bar in order to earn money for an abortion for Yuko. At the end of the school year the two must part as Yuko prepares to depart for acting school in Hokkaido, and Rena gets ready for college.

I Origins follows a molecular biologist studying the evolution of the human eye. He finds his work permeating his life after a brief encounter with an exotic young woman who slips away from him. As his research continues years later with his lab partner, they make a stunning scientific discovery that has far reaching implications and complicates both his scientific and and spiritual beliefs. Traveling half way around the world, he risks everything he has ever known to validate his theory.

Tetsuaki’s struggling to write a novel while his mother fades; Mitsuko’s engagement has been forced upon her unwillingly; the two individuals run away to share their grief.