Yumiko, who is in the prime of her career and has passed the age of 40, registers with a mistress bank to erase the emptiness she feels after abandoning her womanhood, and is embraced by men every night under the name of Yuko. Then, one day, the man who is called is, coincidentally, the president of a business partner she has a crush on... Enjoy the "mistress bank" and "no-panties cafe" that lit up the nightlife of the Showa era.