🇺🇸 yoichi Akaigawa Caldera Onsen: ¥400 Hot Spring Guide (2025) Soak at Akaigawa Caldera Onsen in Yoichi, Hokkaido for just ¥400. Hot 43–44°C baths, open-air tub, big rest area, diner, and easy access from Kiroro & Otaru. Hours, bus, map. 2025.08.24 🇺🇸 yoichi