The person in distress entered Mt. Muroran from Danpara ski resort with snowshoes at around 3:00 a.m. However, the weather worsened during the descent, and the person was on the east slope of the West Ridge course. However, the weather worsened during the descent, and he became inoperable due to hypothermia on the eastern slope of the West Ridge course at an elevation of around 800 meters. After 10:00 a.m. on the same day, a family member, concerned that they could not contact the person in distress, called the fire department. A helicopter of the Hokkaido Police found and rescued the person in distress.