Setagaya (世田谷) is in western Tokyo, and is the largest of the city's 23 wards.
Setagaya has a reputation as an upscale residential district, and features many areas of greenery.
The main train lines serving Setagaya are the Odakyu and Keio (originating in Shinjuku), and the Inokashira, Tokyu Toyoko, and Tokyu Denentoshi (all originating in Shibuya).
Two Setagaya Police Station officers, including Sgt. Toshikazu Suzuki, initially confronted him and demanded to see some identification, allegedly because he was acting suspiciously.
A Setagaya police spokesman declined comment on the case, saying the matter is pending before court.
Following his arrest, Esmaeili was held at the Setagaya Police Station for nearly two months and is currently on trial before the Tokyo District Court.