The story is set in New York which is lit up with Christmas lights. Tokyo Metropolitan Police officer Kido Akari is directing traffic while on her international exchange training program, when a witch-like character pulls a "Christmas Party" prank. Just before a runaway trailer truck smashes into Akari, a mysterious girl suddenly appears and shouts, "I'm going to protect New York and Akari!"

Source: ANN

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Same setting: Monster Strike