Kai is a little mer-boy who's big on hugs—or "squishes," as he and his mama call them. But not everyone's a fan of Kai's spirited embrace, which he discovers soon after squishing a puffer fish, who swells up in fright! Kai feels awful; but with the help of his friends, he figures out another way to show his affection, and then everyone demonstrates their preferred ways of being greeted. Because, as Kai realizes, "Every fish likes their own kind of squish."