Ryujin Brewing Company Gunma Prefecture At the time of the civil wars in 15th century, a warlord from this province found a source of water great for making sake and became a sake brewer. Ryujin’s underground water is very soft and feminine, lending to their brewers the power to draw out the hidden flavors in their rice. Their aim is to create flavorful, mellow, high quality sake that warms the heart upon drinking. They like to combine their traditional skills and methods with the brewer's heart. To this end, they work hard to improve their skills every day to work towards the next challenge, and brew excellent beer in the off season.