A traditional ramune factory in Tomakomai, Hokkaido, is producing carbonated soda in marble-sealed bottles across seven different flavors [3].
The facility maintains a bottling method that dates back to the Showa era. This process preserves a unique cultural beverage experience that relies on mechanical seals rather than modern caps.
Production for the current cycle began in April 2026 [4]. The factory's output varies by report; one source indicates a daily production of 7,000 bottles [2], while another reports the volume reaches 100,000 bottles per day [1].
The signature feature of the drink is the glass marble. This marble serves as a functional seal to keep the carbonation trapped inside the bottle until the consumer pushes it down to open the drink [5].
Despite the functional nature of the seal, several myths persist regarding the marbles. Some theories suggest the existence of "A-type" and "B-type" marbles with different properties. However, reports indicate these classifications are unfounded and constitute misinformation [5].
The factory's operations were highlighted in a broadcast on July 12 [5]. The facility continues to operate in the Uenae district of Tomakomai, balancing high-volume production with traditional craftsmanship.
"1 day 100,000 bottles, the 'Ramune Factory' continuing from Showa," said a narrator for ANNnewsCH [1].
“The marble serves as a functional seal to keep the carbonation trapped inside the bottle.”
The continued operation of the Tomakomai plant demonstrates the enduring commercial viability of legacy manufacturing in Japan. By maintaining the marble-seal method, the factory preserves a specific tactile and sensory experience that distinguishes traditional ramune from modern carbonated beverages, while simultaneously correcting public misconceptions about the product's engineering.
