Detective Tokuno asks Kachou for assistance after a mysterious thief known as Spider keeps evading police detection and arrest due to his acrobatic skills. Meanwhile, Natsumi gets a cold and is forced to stay home and recover. She stumbles upon the burglar while trying to get something to eat. Natsumi unknowingly got the rest of her colleagues sick after Aoi and Yoriko ate with Natsumi in Miyuki's apartment.