Kai Unzen to Open "Jigoku Steam Observatory" and "Steam Lounge" Overlooking Unzen Jigoku on December 1
On December 1, 2026, Kai Unzen in Nagasaki's Unzen Onsen will open an observatory with a view of Unzen Jigoku and a steam-themed lounge serving the new "Steam Pudding," which is steamed at about 120°C.