In the Edo period, the sake was sold under the brand name "Fuji Masamune." However, in the third year of the Meiji era, the first governor of Miyagi Prefecture, Masanao Matsudaira, visited for an inspection. He was so moved by the taste of the sake he drank that he named it "Kenkonichi," wishing it to become the best sake in the world.

Sbout Oonuma Shuzou -Ken Kon Ichi official site-

After a long time, I stopped by this place in Koiwa and had a drink and some a la carte food. The 'Kenkonichi' left a memorable impression with its delicious taste. It's easy to drink yet has depth, and the right amount of acidity was good too. I like it. And ... the Ayu dish was delicious!
I heard that the master started serving non-alcoholic cocktails in the 'Shin-kan' near the station, so I also visited there on my way back and indeed, there were several non-alcoholic cocktails available. I was already full, so I only had a cocktail, but next time I want to eat while drinking. Well, since I'm a drinker, it seems that the non-alcoholic cocktail will just be my last glass (￣O￣;)"