Santa Company is a global organization devoted to delivering gifts to children. Its helpers—called "tonttus"—assist multiple Santas each year by packaging presents, caring for reindeer, and supporting deliveries. Mint Rondo is one of the newest tonttus who has joined Santa Company"s tropical island branch. Following her older brother"s example, Mint starts training together with her friend Thomas Dou and competitor Noah, hoping to become a Santa herself. Unfortunately, her awkwardness makes her lag far behind her classmates and fall into her brother"s shadow.
One afternoon, while relaxing on the shore, Mint, Thomas, and Noah uncover the biggest danger Santa Company has ever faced: ocean pollution! As trash piles up unnoticed, the looming threat will soon harm local marine life and Santa Company staff. With peril approaching, Mint may just manage to straighten out her mistakes and rescue everyone on the island before Christmas Eve. Her determination could turn the tide, ensuring that joy reaches every child by dawn.
