I had a chance to vist 蒙古タンメン中本 (Mouko Tanmen Nakamoto) with I saw video of many times on YouTube. Their Hokkyoku Ramen is one of the spiciest ramens around.
It was spicy but was very tasty. I liked it and I finished it. The shop opens at 11:00am ... I got there at 11:20am and there were about 10 people waiting. When I got out, there were already over 30 people in line.
http://www.moukotanmen-nakamoto.com