A hot spring leisure resort with six theme parks that use the abundant hot spring water of Iwaki-Yumoto Onsen. The temperature is set at 28 degrees Celsius all year so you can enjoy the hot spring all day long, including a swimming pool with a summery atmosphere and the world's largest open-air bath, Edo-Jowa Yoichi. The show featuring hula dancers and fire knife dancers is a must-see! In the summer of 2015, the lazy river pool was renovated and an aquarium pool called Fish-Go-Round was introduced in Japan for the first time; it is a pool that makes you feel as if you are swimming with the fishes. In July 2017, the Body Slider, the largest in Japan in terms of height difference and slide length, opened. It is among an increasing number of fun experiences that only Hawaiians can offer.