FYI: CASH ONLY. No bathrooms (need to use public restroom in the nearby metro station). This is a great spot to try tsukemen (cold thick noodles that you dip in a separate bowl with a thick noodle broth). You order from an electronic kiosk in the entryway that only takes JPY cash. I got the tsukemen with the boiled egg and shaved pork and it was delicious and definitely filling. The restaurant itself is very small with countertop seating and a few tables. It’s a no frills noodles spot where you’re supposed to be in and out and the line outside can get long depending on the time of day but the line moves quickly. There’s no restroom in the restaurant but I was told by staff that there’s a public restroom nearby in the Ueno metro/subway station. I definitely recommend stopping by here if you’re visiting Ueno Park for the cherry blossoms or just want to try some good Japanese noodles.