Ten years after “Mamma Mia!”, The story goes back in time to show how past relationships have resonated in the past. As another day sets over the sunny Kalokairi, Sophie, who manages the Greek villa now, meets Tanya and Rosie and announces that she is pregnant. Still, despite being delighted at the climax, Sophie recognizes her doubts as to whether she will be able to cope without the help of her regretted mother. Sophie is pregnant and, like her mother, Donna, she will be a very young mother. However, Tanya and Rosie are encouraging Sophie, along with Sam, Bill and Harry. They begin to tell the story to the future mother about how Donna did something in her life, alone, despite being a minor and pregnant, and lacking support from her mother. Now, Sophie realizes she has to take risks like her mother.