Carp is obviously not new - it's well-used and a bit greasy. But you'd be greasy too if your main feature was a griddle, and all your food was fried on it. I can't really imagine what you'd look like if your main feature was a griddle though.
Actually that's a point - maybe the staff is really from Hiroshima like it says on the sign. They were very southern in their lack of Tokyo politesse.
I thought I was pretty clever, finding this place. Then I came back to the office and told a colleague who really likes high volume junk food. I said "I had okonomiyaki in Kanda," and he said "Oh, was it Carp? Did you get double-noodles?" I'm glad I didn't know it was an option.
I've got a card on my desk that a colleague gave me for a birthday years ago. It says "YOU ARE ONLY YOUNG ONCE, BUT YOU CAN STAY IMMATURE INDEFINITELY."
It says "-OGDEN NASH-" after that, so it's not like someone at Hallmark is wonderfully creative.
If you wanted to eat at the source, drink from the font, that sort of thing, you could visit the original shop in Hiroshima's 'Okonomiyaki Village' (since 1976). Looks like this one is better though.