More then 100 years ago, we opened up as "Radium Hot Springs". At time it was a rare healthy land style management. After that, we rebuilt twice, and now we are operating on the first floor of a 4-story apartment building. Previously, as a local public bathhouse in Minatoku Azabu, "Takenoyu", we had not applied for hot spring bath (Onsen), but we wanted many people to know the merit of this hot water, and in December 2002 We took the approval of hot spring bath. The name of the hot spring bath is "Azabu Kokubisui Hot Spring Bath." This name was based on the color of blackish brown water and the customer's voice that when your body enters the hot water it gets slippery. You will need to try it out once.