It's sumo season in Tokyo! Though, to be fair, it's sumo season three months per year, as this arena, the Kokugikan in Ryôgoku, on the East bank of the Sumida-gawa two stops from Akihabara on the Chûô-Sôbu line, hosts half of the year's six major tournaments.
It wasn't open when I visited Tokyo, so I didn't see inside, but even then, there are apparently, and unsurprisingly, a lot of sumo-related places to visit in Ryôgoku, like Ekô-in temple... and I missed them all! Well, apart from the odd statue.
I went to Ryôgoku area without a real plan, I wandered around and found some interesting places I'll get to another time, but one thing I think I planned was to try the "lunch of champions", the classic stew for sumo wrestlers: chankonabe, or chanko for short. It was rich and copious, as you'd expect, and, as I remember, I didn't quite finish it.