After failing his exams, 20-year-old Dick is left alone in his parents' large house for the summer — a "punishment" that quickly turns into a dream: no rules, no obligations, just games, food, and complete freedom. But his perfect summer is shattered the moment Millie, his cousin, whom he barely remembers from childhood, shows up on the doorstep. She's cheerful, naive, and completely devoid of awkwardness. While Millie enthusiastically makes summer plans — swimming, watching movies, and just generally having fun — Dick becomes increasingly entangled in his own thoughts and fantasies, which become less and less harmless with each passing day. Now Dick must find out if this summer can be the best of his life or if everything will spiral out of control faster than he knows it.