This hot spring resort is mysteriously called "the hot spring of the sea in the forest. The reason for this is that the source of the hot spring is old seawater trapped underground due to ancient crustal movements. The source of the hot spring is old seawater that was trapped underground due to crustal movement in ancient times. Even though it is a hot spring, its salt content is said to be about twice that of seawater. This is a rare hot spring resort with one of the nation's most salty hot springs.

The two springs are the light yellowish-brown "Golden Hot Spring" and the translucent "Silver Hot Spring. Both have a reputation for rejuvenation.

Guest rooms include the "Ai" and "Beni" special rooms with cypress-scented baths, as well as luxurious Japanese-style and Western-style rooms.

The cuisine is a Japanese-style meal featuring local ingredients from Hachimantai and Abei. In particular, the takikomi-gohan (rice cooked with vegetables) using additive-free, pesticide-free "abi maitake" mushrooms is very popular! The tofu store "Fuzetsuhana," a famous tofu store in Hachimantai with a reputation for making products using only domestic soybeans, water, and bittern, is also highly acclaimed.

Enjoy the time that passes slowly at Seiryukaku.