In front of Taiseido Books (大盛堂書店) — the bookstore at the entrance of Shibuya Center-Gai, right after you cross Shibuya Scramble Crossing.
What to look for: A large blue-and-white sign that says 「大盛堂書店」 on the corner building. We’ll meet outside, in front of the main entrance (not inside the store).
The tour ends at the Tokyo Metropolitan Government Building, about 10 minutes on foot from Shinjuku Station