Dens: This was rec'd to me as Best Ramen in Tokyo & it didn't disappoint. You order with 2 variables -- spicyness (I went 2 of 4) and numbing (I went 3 of 4). Numbing is amazing (& I'd rec'd going 4 of 4)
Ike Song: IT IS ALL WORTH IT! Come here early, or budget at least an hour waiting time. No sign-up sheet or reservation, old fashion lining up for food. The shop is small that can only sit 8 people...but WOW!!!