When Masao gets a job, his father Ginji decides to remarry. Without knowing anything about it, he is introduced to his new wife, Misora, his private tutor from his high school days. Masao secretly has a crush on her, but is unable to congratulate the couple on their marriage, saying, "I can't accept that Misora ​​is my mother!" Every night, Masao consoles himself by fantasizing about Misora's lewd acts, and Misora ​​treats him kindly. One day, Masao finally reaches his limit and releases his pent-up desires onto Misora's ripe body...