About:Beppu City, Oita Prefecture, where ONSENSOU was born, is the hot spring city that boasts the largest number of springs in Japan. It all started when researchers started asking a simple question: "Why do hot springs make your skin beautiful?" This led to many years of research, ONSENSOU finally discovered new species of "hot spring algae" and "hot spring yeast". It has been confirmed that it is a new type of microorganism with unique characteristics that can be said to be the source of hot springs. ONSENSOU is a hair care series from Japan that luxuriously blends these two hot spring ingredients.