Toko marries Koji, the manager at her part-time job, and nervously meets his adult son Hanzo. She is stunned to find him handsome, muscular, and overwhelmingly masculine. She loves her older husband, but he cannot satisfy her powerful sex drive, so she secretly orders aphrodisiacs online and keeps slipping them into Hanzo's meals. One day the drugs finally turn him into an unstoppable erection monster—and Toko mistakenly takes them too, becoming just as wildly aroused.