KUROYU
One of the signature features of this onsen, whose name translates as “black onsen,” is its black hard-boiled eggs.
Fresh eggs are placed in nets and submerged in the onsen’s hot spring source to boil.
After the eggs sit in the sulfurous onsen water, the hard-boiled eggs turn black on the outside from the chemical reactions.
The egg on the inside remains white, and the hard-boiled eggs are said to not spoil for a long time because of the minerals that help kill bacteria.
This directly translates into what Kuroyu believes the onsen can do to help the body.
The minerals in the hot spring water, rich in aroma, are believed to help heal skin diseases and detoxify the body.
“Waterfalls” of onsen water, which can also be found at Magoroku Onsen, are available in a separate hut near the baths to help soothe sore muscles with a natural, water-pressure massage.
Said to have been established 330 years ago, Kuroyu is the furthest onsen from the Nyuto Village.
The ryokan is known for its longterm stays available for toji-ba (long-term stays), fully equipped with a kitchen where you can prepare all your own meals and an outdoor BBQ for anyone to enjoy.
If you’re looking to go more towards the relaxation route, though, you can have dinner served in your room.