List of Japanese food to try

Kushi katsu at Shin sekai in Osaka!!

Here is image of oden at convenience store.
http://trendy.nikkeibp.co.jp/article/pickup/20130823/1051638/
You can buy them at convenience stores even in summer nowadays.
Put any items you like into a polystyrene container, as sd already said.
http://www.sej.co.jp/sej/html/products/ff/oden/

I think in Japan, if you have the time you must eat the following foods:

Okonomiyaki, both the Kansai and Hiroshima styles
Gyudon beef bowl
Soba, udon or ramen noodles
Sushi from a place that serves it in an unusual manner like a kaiten sushi restaurant
A set meal from a teishoku-ya restaurant

Japanaese curry!

Google "カレー" then you'll find it in fantastic variety!!

Even some Japanese forums serve you online.
Try!
http://ikura.open2ch.net/test/read.cgi/curry/1369348117/