Part 1: Zeus is sick of all the hate, envy, and violence that humans cause on Earth. So he gives Priapus the important task of making all human males homosexual, in order to destroy any means of humans to leave behind children. Priapus descends to earth, meeting his first target, Ousuke Sakura.

Part 2: Priapus continues the mission that Zeus sent him on. This time Priapus ends up in rural Japan and meets his next target, Honda, a police officer.