At around 6:20 a.m. on August 22, the people in distress entered the mountain from the Hachinosawa outcrop on the Totsubetsu River and were aiming for Horoshiri-dake (幌尻岳). At around 7:10 p.m. on the same day, while setting up a tent at an elevation of 1,800 meters and using a gas stove to boil water in the tent, the gas stove collapsed and the victim’s right hand and both legs were scalded by the boiling water. At around 7:45 p.m. on the same day, he called the police through an acquaintance and requested rescue. Rescued by a Hokkaido Police helicopter in the early morning of the following day, August 23.