Rei is a beautiful wife who is married to her beloved husband and lives a happy life. Although it is not yet time, she takes her temperature and writes it down in her diary Itsuka day in anticipation of the day when she will be blessed with a child. However, Rei's ovulation day becomes a cruel day when a strange-looking man hiding his face with a balaclava commits a selfish seed rape in an attempt to fertilize the married woman, Rei, with his own seed! The man commits this heinous act not for pleasure but to leave descendants!