Subway superhero helps citizens of Tokyo
22 August 2013 Last updated at 20:56 BST
Tokyo's metro system is the busiest in the world, and notoriously difficult to navigate.
If you have heavy luggage or a pushchair, the lack of escalators or elevators makes matters even worse.
This is complicated by the fact that Japanese culture makes it difficult to accept a favour from a stranger.
Now one resident is taking matters into his own hands, with the help of a $40 superhero costume.
Jonathan Josephs reports.