"Look at that slimy body.
That silly shell.
Those tentacle eyes!
I just can't look at you anymore, snail."

Ari is feeling angry. When she takes that anger out on an innocent snail, the snail demands an apology! Which Ari gives, half-heartedly. And that's that. Until Ms. Snail and her friends appear in every corner of Ari's life, determined to elicit the most genuine apology from an increasingly regretful girl.