As of September 1st, 2015, Kururi is closed. I braved the line on their last day, a line of 40 people that took about two hours, to slurp it one last time.
Kururi, for me, is a very important shop. When I started this site, back in the end of 2008, the only resource I had was a ranking list of shops from some TV show I managed to find with an internet search. Kururi was that list's number one. And for me, it was the first time I had something that truly blew me away.
The infamous black sign. Kururi had no way of inviting you in. Just a small shop with a blackened wood exterior, next to a tire shop, with a long line.
My ramen guidebook, 最強アメリカ・ラーメン男 東京 極ウマ50店を食べる, is now officially outdated.
My original, and very old, write up of Kururi is here.