A large communal bath prized for its outstanding views overlooking the vast Kanto Plain. It has both an indoor bath and an open-air bath, with views of Hitachinaka Port and Kashimanada by day, and glittering city lights and a sky full of stars at night. This hot spring uses water from Fūjin no Yu, the source spring of Tsukubasan Onsen, and is an extremely alkaline simple hot spring with a pH of 10.18. Guests can enjoy the superb, silky-smooth feel of the water as it gently softens the skin’s roughness, making it truly the ultimate beautifying bath.

A medicinal bath located in the open-air area of Tenkū no Yu. It uses fragrant herbs that vary by season, and guests can soak while feeling the clear breeze carried by Mount Tsukuba’s great natural surroundings. Its warm, aromatic effects, different from those of a hot spring, gently ease travel fatigue and everyday stress, making this a seasonal bath full of atmosphere.