If the player talks to Noelle during the epilogue in Chapter 1, tells her about Susie eating chalk, and then imports the resultant data to Chapter 2, she'll gift her an entire lunchbox full of chalk during the prologue to the latter, complete with a unique cutscene.

When brought into the Dark World, the chalk turns into the LightCandy healing item; using it on Noelle results in her commenting on the fact that she'd previously given it to Susie.