Bitter Sweetheart is the naked truth about Lina Berglund, a perfectly normal 15-year-old who tries to start living like her friends, who seem to have so much fun.

Ida lives hard and fast with too much drinking and a string of boyfriends, Sandor has very few friends and his mother insists that he practices ballet. They meet in a chat room and despite appearances they discover they have much in common. Sandor and Ida lives in different cities and when Sandor unexpectedly visits her it ends with disaster.