Saki , a married woman, is studying English under her private tutor Misora . While her affection for her husband, who is rarely at home, fades, her love for Misora, who is so considerate to her, grows stronger day by day... Unable to resist, she finally pushes Misora ​​down at the end of the lesson. Misora, though bewildered, accepts Saki 's love. They seek each other out, Kokoro inserting a double-headed dildo and a strap-on, as if to fill the gap in their hearts... But then something happens between the two of them.