Before it became the otaku paradise it is today, Nakano, Akihabara were the centers of Tokyo's porn industry (due to their proximity to Shinjuku and Ueno, respectively). Both areas have changed over the years, but blatant exhibitionism in Akihabara (like in this photo) is rare - replaced by legit cosplay acts. In Nakano, there are still certain off-the-radar spots where you may still encounter some porno-filming shenanigans.
The autumn leaves are changing. It’s time to tackle the otaku mecca – Akihabara!