Pencil and Eraser are on their way to their first ever karate class--well, their person Stella is and they are tagging along. When Pencil gets a little too excited practicing her ninja moves, she falls right out of Stella's backpack and lands on the sidewalk! And naturally, Eraser has no choice but to follow her.

Stranded all alone in the big wide world, these two buds will have to use their wits, charm, and of course their impressive ninja moves, to find the dojo and make it safely back into Stella's backpack before class is over. Between squirrelly obstacles and flashy distractions, will the duo (ahem, Pencil) stay on the straight and narrow long enough to get where they belong? Or will they be doomed to draw outside the lines for good?