I introduce another Ramen that you can eat in Asakusa area.
Bannai is Ramen franchise. There are lots of shops in Tokyo and some in Kansai area, too.
Asakusa shop is located just 5 mins walk from Kaminarimon.
You can try "Kitakata Ramen" at Bannai, one of the big three local Ramen in Japan.
I really like Ramen of Bannai.
The pork is greasy but the soup is not oily. I love this combination of noodle, soup and pork!! Yummy!
There is one shop in L.A. as well.
Bannai in LA
http://ramenbannai.com/
Bannai in Asakusa (Japanese page)
http://ban-nai.com/store_page/b19/b19index.htm
