In a school in small-town west of Ireland, Connell is a well-liked, good looking and athletic student. Marianne is a proud, intimidating and unpopular loner who actively avoids her classmates and questions her teachers’ authority.

Connell and Marianne’s relationship continues in secret and they sleep together for the first time. At school, Connell makes excuses for why he didn’t see his friends at the weekend and evades questions on his mother’s job at Marianne’s house. A girl in his friendship group, Rachel, gets impatient with Connell’s lack of interest and tensions build for Connell.

The night of the Debs is approaching and the girls at school have organised a fundraising event. Marianne has been asked to help and is out of her comfort zone. At the club, one of Connell’s friends Karen does her best to show Marianne some kindness but Rachel behaves coldly towards her.

After a tragic event, Connell struggles with severe depression. Marianne remains a lifeline for him from abroad.

Marianne and Connell are back in Dublin and together as a couple. Life is calm and they are at ease with each other. Then Connell receives news that he has been offered a place to study in New York. Neither of them know how to process the news and so they decide to let it sit.