Sanae ( Reiko Sawamura ) reunites with her high school classmate Hitomi(Reiko Kobayakawa Reiko) for the first time in five years at a class reunion held last year. Sanae is now married, and Hitomi is still working as a career woman, but in the past, their relationship was deeper than that of friends. Just as she was thinking that it was all a youthful mistake at the time, Hitomi suddenly shows her fangs. Sanae is frightened by Hitomi's aggressive approach and completely rejects Hitomi, but one evening, she receives a call from her husband's mobile phone. She answers the phone enthusiastically, and it is none other than Hitomi...