A Monkey, A Mushroom, and a Time Bomb

Chief informs the gang of a possible bomb threat at the Riverside Mall. The bomb is set to go off during a major shopping event that involves families and kids. Miyuki, Natsumi, Yoriko, and Aoi are assigned to search for the bomb, but they must wear mascot costumes and blend in with the festivities. Miyuki gets to wear the Mushroom costume, and she befriends a five-year-old boy and his younger brother. The younger brother makes off with a car model from a raffle but the older one tells him to return it since it's stealing but they freak out when Nakajima arrives at the scene. Will they find the bomb in time, and what will the boys do?