A ryokan on a hill near Nagoya with unreal views of the bay, mountains, and city lights along the coast. Quite budget-friendly yet the service is top-notch. Probably not very popular due to its location. Several rooms have private rotenburo (open-air baths) on the balcony with a view. There are also very affordable single rooms for solo travelers. Two communal onsens - one on the rooftop and one on the first floor. The rooftop one is a rotenburo with an amazing view, although it has a glass fence. The lower one is a good indoor onsen with a sauna (which was under maintenance). No cold baths. Kaiseki meals of several varieties are served in the restaurant with a splendid view. The kaiseki itself was decent, though I've had better. All the staff were excellent, surprisingly all Japanese. In the evening, entertainment included a telescope and a gentleman who showed the stars.
Tennomaru
天の丸
A hilltop ryokan above Mikawa Bay with panoramic baths and a stargazing deck
Day Use
NoBathing & Water
Uses natural hot spring water
Open-air outdoor bath
On the roof
Enclosed indoor bathing area
Sauna room of any kind
Cold water plunge bath, typically used after sauna
Bathing Arrangements
A private bath you can reserve for yourself or your group
4 options, 3300yen 45min
Private onsen bath in guest rooms, for overnight guests only
Shared bathing area for all genders
Policies & Services
Allows entry with visible tattoos
Welcomes children and families
Site recommends the large tatami room "Oshima" for family stays with small children.
Shower, wash stations, soap and shampoo provided
On-site or nearby parking available
Views
City
Sea
MountainsAbout
Tennomaru sits on a hill above Mikawa Bay, part of the Gamagori hot-spring area. Two outdoor baths face the water, open to the bay by day and to the city lights after dark, plus two smaller baths that can be reserved for a private soak. The water in all four is clear and alkaline, locally known for leaving skin smooth. A separate indoor bath downstairs shares the same view but is filled with regular hot water rather than the spring, and some rooms come with their own open-air bath as well. The ryokan markets itself for anniversaries and family milestones and leans into it: a deck for stargazing with loaner telescopes, star-photography and calligraphy art displayed around the building, and three robot dogs that greet guests in the lobby. Reviewers describe the drive up as a narrow mountain road and the stay itself as remote and quiet, with an unbroken view from every room, bath and the dining room.
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4.0
1 review
Last updated September 19, 2026