Aoi, a student who secretly has feelings for Eimi, a teacher who married her colleague this spring and is still teaching, is unable to concentrate on her studies and her grades are worsening. Eimi, unable to see him like this, calls her girlfriend Aoi to her home and teaches her about her studies, but...Fortunately or unfortunately, Eimi's girlfriend's husband is away for four days leading club activities. timing. A once-in-a-lifetime opportunity that Aoi never expected has arrived. *The contents may differ depending on the distribution method.