Having left his mother Reiko's place, Susumu lives in a share house within the city and has been eagerly awaiting next week's "long holiday." The reason is that he plans to invite Reiko to his home the moment his roommates leave during the long holiday... And on the day it arrived, Reiko came to the share house where Susumu lives. Opening the door, Reiko silently presses her lips against Susumu's. From that moment until the moment 24 hours later when Reiko leaves, the two begin their intense incestuous affair.
