Port code 1321 is about 16-year-old Agnes and Steph, who are forced to become stepsisters over a summer when their newly-loved parents go on a romantic holiday and leave them alone with Agnes' little sister Bill in an apartment in Stockholm. From the beginning they hate each other but quickly realize that they are in the same boat and must somehow make it all work. Something that turns out to be easier said than done. Their summer is bordered by both euphoria and disappointments and causes them to finally land on some valuable insights - they learn about where their own limits are and find their self-respect. Through hard trials, they understand that you don't have to be a certain way to be liked. You can also just be who you are. The second season went under the name "Portkod 1525" and follows Agnes and Steph during the very last weeks of high school.