After acquiring a mysterious medicine left behind by an elderly stranger, a man finds himself suddenly invisible and decides to explore this unexpected gift. He slips unnoticed into a bustling public bathhouse, wanders the halls of an all-girls academy, and later enters the apartment of a female coworker, each setting offering new opportunities for discreet observation. His bold experiments continue until the invisibility unexpectedly begins to fade, turning his private escapades into a precarious situation.
