A female teacher and wife is tasked with going on a preview trip for an upcoming school excursion. Due to budget cuts, her only companion is a single male teacher. While there are no issues in her marriage, her husband holds a prejudice against the teaching profession, believing it to be "unproductive and full of gloomy people," making the idea of an overnight business trip with another teacher unpleasant for him. For Miho, who has no interest in anyone but her husband, this should have been an unnecessary worry. However, her seemingly respectable colleague begins to relentlessly direct his gloomy sexual desires toward her...