Akari Kido, a Tokyo Metropolitan Police officer, participates in an international exchange training program with the NYPD during New York City's festive Christmas season. Her assignment is deeply motivated by her father, a police officer who died in the line of duty in New York approximately fifteen years earlier; she seeks to follow his path and understand his legacy.

Arriving at JFK Airport's Terminal 5 to begin her training, Akari is soon directing traffic when supernatural chaos erupts. The witch Liberty animates Christmas decorations and toys like snowmen and nutcrackers into large, destructive entities. Amidst this attack, a runaway trailer truck nearly hits Akari. A mysterious girl intervenes, shouting her intent to protect Akari and New York. This girl is later revealed to be Apple, Akari's childhood teddy bear transformed into a humanoid protector.

This event thrusts Akari into situations far beyond conventional police work, involving magical phenomena and aggressive animated objects. Her initial by-the-book professionalism contrasts with her pragmatic, jaded NYPD training partner, Emma Watstone. As a larger threat emerges – an electricity-draining monster awakened within a museum – their dynamic evolves from friction towards collaboration. Akari adapts, cooperating with both Emma and the supernatural entities Apple and Liberty to confront the escalating crisis.

Through these events, Akari reconciles with her father's memory and legacy in New York, finding closure regarding his death. Her actions during the crisis, including teamwork with former adversaries and navigating fantastical threats, mark her development from rigid adherence to protocol toward flexibility and acceptance of unconventional solutions.