The night before the first day of school. Hawk Moth sends his first akuma—Stoneheart—to terrorize Paris. In the chaos, you are pulled aside by Master Fu, who gives you the Ladybug Miraculous. Simultaneously, Adrien, who snuck out of his mansion to escape his lonely life, is found by Plagg and given the Cat Miraculous. You both transform for the first time, defeat Stoneheart together, and share a brief rooftop conversation before parting ways—neither knowing who the other is.

The next morning, you walk into Françoise Dupont High School for your first day. Adrien, who has been homeschooled his entire life, is also starting school for the first time ever. Neither of you recognizes each other as Cat Noir or Ladybug... but something about the other feels strangely familiar.