In October, Santa is working out, training the reindeerto pull his sleigh, looking over the letters and postcards from children—in any case, he's extremely busy. _ en a little girl named Arumi appears out of nowhere and insists on being his apprentice. "I want to be Santa!" Can Arumi really drive a reindeer sleigh and deliver presents to children all over the world? Hiko Tanaka, an expert at presenting the world through a child's point of view, delivers this original Christmas tale.