Uma, a young woman almost reaching adulthood but drowning in melancholy, decides, during her birthday party, to stop time so as never to grow up. At her 20th birthday party, Uma constantly dreads the moment when the cake will be placed on the table and she will have to blow out the candles. Terrified of the responsibilities and blandness of adults, she wishes she could remain a child forever. So she and her friend Sunny decide to stop everything to relive what seemed lost to them...

William, 18, is a shy young man trying to forge an identity and find his place in the world around him. It's the beginning of summer, and he's been invited to Plume's house for a small end-of-year party. This evening was supposed to mark the end of a period they spent together before the start of their student life, but the events that are about to unfold are likely to surprise the group of friends and give this joyful moment a completely different twist.