Super-Express Yamanote Line Incident

A pair of pickpockets are seen snagging valuable items from young women at a train station. Yoriko and Aoi have been dispatched to bring the pickpockets in, while Natsumi and Miyuki are to act as backup. Unfortunately, Aoi becomes more occupied with arresting perverts and molesters. The pickpockets spot a business group with a briefcase boarding a train.

Synopsis excerpt via Kitsu.