When Sarah's school has a little sister or brother day, Sarah decides to invite Caillou to spend the time with her class. Caillou packs his school bag and a lunch and is off to first grade. He feels like a big kid. Caillou's favorite things are recess, lunch hour and drawing on the blackboard. He doesn't enjoy all the bells and rules as much. Caillou may not be quite ready for school, but he is definitely ready for an afternoon nap.