There's a ramen place in Tokyo that I LOVED
Take the Keio line from Shinjuku, to Shibasaki (you have to take the local train)
Get off the train, and walk straight in the opposite direction of the 7/11.
The place is
hereHuge bowl of ramen for 500 yen (like $5 USD), double noodles for free. Ask for "Shoyu ramen" and be a happy man
Coin operated restaurants are also a lot of fun. Don't need to talk to anyone, and if you don't speak Japanese, it'll be a lot of fun seeing what you get when you order. I think they have these in Korea as well.