Soon after her daughter Mei was born, she divorced her husband, who had become addicted to gambling and was drowning in debt. She worked hard for the past 10 years so that her daughter would not have to struggle because of being a single mother. Her daughter graduated from university, got a job, got married, and a bright future was waiting for her. Then, one day, she unexpectedly had a relationship with her daughter's boyfriend. Despite his love for his daughter, he was unable to control the desires he had been suppressing, and he was overcome with a numbing pleasure as an electric current ran through his body...