It all begins on the day Stephanie proposes, 'If you give me a cookie, I'll be your best friend.' From then on, the two girls are inseparable, but not always at peace. They love to giggle, whisper, observe their classmates, and share their most outlandish secret dreams. But sometimes they are at odds. Some days one doesn't feel like sharing. Taking turns isn't always easy. If they can't agree on a game to play, who decides? One day it seems like Stephanie is mad for no reason at all. The ups and downs of friendship can be steep, and often unpredictable. My Best Friend, Sometimes navigates the path of two girls moving towards, away from, and back together again.