Children have been missing the past few days. The Christmas spirit was quickly drifting away. The town was losing hope, and feared the multiple possibilities of what might've caused the children to disappear so sudden. One of the best detectives, detective L/N, was sent countless amounts of letters that desperately asked for her help. She, at first, did not want to take their request for she was in her vacation... But the sudden disappearance of her younger sister is what made her say yes.