Hokigo Onsen Beppin no Yu no Yado Marushinso is a hot spring inn located in Kitago Town, Nichinan City, Miyazaki Prefecture, which opened about 30 years ago. The inn offers 51°C natural hot spring water flowing directly from 800 meters underground as a free-flowing source, boasting one of Kyushu's highest-quality springs known as 'Bijin-yu' (Beautiful Skin Hot Spring). The spring water is drinkable and is recognized for its therapeutic effects on chronic digestive disorders, chronic constipation, diabetes, gout, and liver disease.

The inn's greatest feature is its spring, aptly named 'Beppin no Yu' (Beautiful Person's Hot Spring), renowned for its high skin-beautifying effects. The spring quality is sodium bicarbonate spring, with 700-800 tons of water flowing daily. While the source water is described as colorless and transparent, the bath water appears in a light tea-brown color and is kept at a slightly hot temperature of 42-43°C. For bathing, it is expected to be effective for rheumatic diseases, motor organ disorders, chronic eczema, keratosis, ovarian dysfunction, and menopausal disorders.

The bathing facilities include indoor baths and open-air baths. The men's area features a rock-style open-air bath, while the women's area has a quietly secluded open-air bath. Notably, the facility provides drinking spring facilities using bamboo tubes, allowing guests to taste the source water directly. The drinking spring has a distinctive taste reminiscent of hot broth, enabling guests to absorb the spring's benefits from the inside.

The inn has a total of 9 guest rooms, well-equipped with amenities including toothbrush sets, razors, towels, bath towels, yukatas, and slippers. A shop and vending machines are also available. Day-trip bathing is offered, making it widely popular among both local residents and tourists.

Kitago Town in Nichinan City is blessed with nature, with nearby tourist attractions including the Nichinan Coast and Obi Castle. Hokigo Onsen is known as a base for such sightseeing and is particularly popular among female visitors seeking beautiful skin. It is an attractive facility where guests can refresh both body and mind with natural free-flowing hot spring water.