Mayumi grew up in a very ordinary family, got a job as a clerical worker at a transportation company, and got married a year after dating a section manager at a food processing company whom she met through a friend's introduction. She has experienced 10 people, and had a relationship with a man other than her boyfriend if the atmosphere was good. Seven years passed after she tried to conceive, and the number of times she had sex gradually decreased. Mayumi wanted a drinking buddy because she liked alcohol. She sometimes went out to drink without being told anything, so she started drinking with the men she met at the bar. One of them was Hyottoko's father. She was looking forward to meeting her father, who somehow spoiled Mayumi.
