Honestly the best ramen I had ever had (okay, I may not have better ones). Really well-balanced broth, flavourful, not too oily, not too salty. Loved it how the noodles does not have that sulphuric taste.
The broth was so so good that all the noodles were gone in a blink of an eye, and I couldn't help but get an extra serving of noodles!
Oh! By the way, the best part of Ichiran Ramen of the Ueno outlet - is that it is 24 HOURS (!!). This was a good relief for us tourist (as Japan shops closes rather early around 9/10pm).