"Gakkogura" is a former school on Sado Island that was renovated in 2014 by Obata Sake Brewery, a long-established sake brewery founded in 1892, as its second sake brewery. Sake is brewed here during the summer and is based on four pillars: "sake brewing," "coexistence," "exchange," and "learning." Sake is brewed using raw materials that preserve biodiversity and renewable energy from solar panels. The by-products, sake lees and koji, are served in the on-site Gakkogura Cafe as fermented dishes combined with ingredients from local producers, helping to reduce food waste. The long-term "Sake Brewing Experience Program" and "Special Classes at the Gakkogura," which also teach about local recycling, attract participants from Japan and abroad, and the community continues to grow every year.