Yellow Beer Works has announced a collaboration with Underground on Instagram, introducing a beer called "Floating Smoothie Chocolate Mint." The post says the beer will be tapped only at YBW's directly operated venues and at Underground.

Based in Osasao, Fukushima City, Yellow Beer Works describes itself on its official site as a brewery run by one of the city's largest rice farms. The brewery says it uses some of its own rice and vegetables, along with fruit from local producers, as part of its recipes. Its stated goal is to make beers that leave people smiling.

The brewery also operates both the Osasao brewery and the Bunka-dori taproom in Fukushima City, giving it a strong local footprint. That background makes the collaboration feel consistent with the brewery's approach: ingredients and ideas rooted in place, but open to playful twists.

As the name suggests, this release centers on chocolate mint, presented in a smoothie-style format. The post does not spell out full technical details, but the limited tapping arrangement alone makes it a noteworthy one for fans following Yellow Beer Works' more experimental releases.