For those who have been to Mitsuwa, this is the same franchise as the ramen shop inside their stores! We were staying only a 1 minute walk away and we came back here twice during our trip. There was a line the first time we went and we only waited about 20 minutes. We came when they opened the next time and we didn't wait at all.
If you love spicy ramen, this place has the absolute best kara miso ramen that I've ever had in my life (so far). The second time around, I tried the regular miso ramen which was delicious, but it didn't "wow" me like the kara miso. The broth is extremely flavorful and well-crafted and the amount of noodles in the bowl were generous. I ordered the combo which came with a rice bowl (shredded pork). The add-ons to your ramen (corn, veggies, soft-boiled egg, etc.) are a la carte and come in huge portions. The handmade gyoza is also a great appetizer to start off with. All of our food came out fresh, hot, and quick.
Sevice is friendly and efficient. The restaurant itself is small, so it's not good for groups. There were only a few tables and bar seats. You'll get seated quicker if you're in a pair.