The ramen shop founded by Yuki Onishi that became the world's first Michelin-starred ramen shop was Tsuta.
Onishi opened Japanese Soba Noodles Tsuta in Tokyo's Sugamo district in 2012. The shop's name was later shortened to Tsuta, a Japanese word meaning “ivy.” Its recognition was historic because ramen shops had generally occupied a different place in restaurant culture from the fine-dining establishments traditionally associated with Michelin stars.
Tsuta received a Michelin star in the guide covering Tokyo in 2016, often reported as the first Michelin star awarded to a ramen restaurant. Its cooking emphasized carefully developed dashi stock and shoyu ramen rather than treating ramen as merely a fast, inexpensive meal.
The answer is not Ippudo or Ichiran, both internationally prominent ramen chains, nor Rairaiken, an important name in ramen history. Tsuta is also sometimes described as “Japanese Soba Noodles Tsuta,” its original full name. The restaurant later moved from Sugamo to Tokyo's Yoyogi neighborhood and expanded internationally.