The hotel is very large, divided into old and new buildings, each with its own hot spring that can be used by all guests.
The hotel is located near Shimabara Port, and the bus outside the hotel is also a midway stop for the Unzen Onsen Bus.
I only went to the main hotel's hot springs, which have indoor and outdoor hot springs. The biggest selling point is the carbonated water pool, which requires you to endure the cold when you dip in it.
The only drawback is that the wifi in the room needs to be received first near the door, and the line will be disconnected immediately when the group goes to the window.
The breakfast restaurant is underground, and it is a beautiful buffet breakfast with sea view.
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