Castellucci Hospitality Group and chef J. Trent Harris, the team behind Mujo, The Atlanta Journal-Constitution’s No. 1 restaurant on the Atlanta 50 list, have announced they will open their second restaurant, Koshu Club, in early 2026 in Buckhead.
Koshu Club will be an “elegant dining experience” inspired by the Showa-era supper clubs of Japan, according to a news release. The Showa era refers to the reign of Japanese emperor Hirohito, posthumously called Showa, which began in 1926. The phenomenon of Showa nostalgia hearkens to Japan’s post-World War II economic boom when there was an “explosion of culture and film and art and cuisine,” Harris told The Atlanta Journal-Constitution.
The restaurant won’t be a direct recreation of the era, he said, but “we’re definitely inspired by that style of dining, those style of menus, and some of that sort of unpretentious hospitality of just making really delicious food in a really comfortable environment.”
Koshu Club will be located in the 99 West Paces apartment building across the street from the St. Regis Atlanta hotel. Harris will lead as executive chef along with Mujo’s Keith Miller as chef de cuisine.
Harris said Koshu Club will see the same level of service and quality of food as Mujo, “just in a little less structured format.”
The menu will focus on contemporary Japanese food as well as washoku dishes, or traditional Japanese cuisine, and yoshoku dishes, a style of cuisine that adapts Western dishes to Japanese methods and ingredients, like tonkatsu and curry.
“The other things that I love about Japanese food, some of those other things that we don’t really offer as much at Mujo, I’m excited to offer (at Koshu Club),” Harris said.
That also includes seafood and cuts of meat prepared in the art of sumibiyaki, or slow-grilled over binchotan charcoal.
The impetus for Koshu Club came from Harris and Federico Castellucci, president of the hospitality group, wanting more guests to experience the cocktail program at Mujo. The small space makes it challenging to welcome more people at the bar, Harris said.
Koshu Club will be slightly larger than Mujo with 10 tables and 15 seats at the bar, but it will still be intimate and reservation-only, Castellucci said.
The beverage program, led by beverage director Nicholas Quinones, will include an extensive, curated sake selection, Japanese-style cocktails and a wine cellar that highlights classic and emerging producers from around the world.
The interiors are designed by Smith Hanes Studio and will balance “warmth and precision” with the goal of evoking mid-century Japan, according to a news release.
Harris, a New York City sushi chef, founded Mujo as a takeout-only omakase pop-up in Castellucci Hospitality’s tapas restaurant Cooks & Soldiers in 2020. After its success as a pop-up, the team opened Mujo as a brick-and-mortar in 2022 in west Midtown.
The omakase restaurant’s exclusive, multicourse and pricey concept has received numerous accolades. It earned a Michelin star in Atlanta’s debut guide in 2023, and it has retained its star in every guide since.
The Atlanta Journal-Constitution dining critics Henri Hollis and Ligaya Figueras also selected it as the best restaurant in Atlanta for the 2025 50 Best Restaurants list.
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