`One Drop` is a craft beer spot in Ote-machi, Numazu City, Shizuoka. Its official site lists multiple beer styles, including Pilsner, Kölsch, Weizen, IPL, IPA, Hazy IPA, Porter, and Red Ale. The venue also serves beer-focused dishes such as pork simmered in beer and steamed clams, showing a food-and-beer concept at the core of the business.

In the Instagram post, the brewery is described as a basement hideaway in Numazu's shopping district. It also says that in 2025, the shop added a penguin tank in partnership with a local aquarium and was reborn as a "penguin x craft beer" venue. Tsukuba Craft Beer Fest 2026 will be its first appearance at the event, and the featured beer will be `Uchiura Saison`, made with mikan grown in Numazu. The beer is presented as a local expression of place and season.

The festival will take place at Tsukuba Center Square from October 16 to 18. According to the post, hours are 3:00 p.m. to 10:00 p.m. on the 16th, 11:00 a.m. to 10:00 p.m. on the 17th, and 11:00 a.m. to 6:00 p.m. on the 18th. Admission is free, and drinks are purchased directly from each booth. The brewery's Numazu-made beer is likely to draw attention from visitors looking for something distinctive.