Yuji Shinohara (played by Hideaki Ito) used to be a firefighter. Now, he lives a quiet life with his wife and children. One day, Yuji took his daughter out to play and suddenly encountered a tunnel collapse while riding the subway. It turned out that the earthquake a few days ago caused a sudden change in the climate, the sea water heated up, hail fell, strong winds raged, huge waves were surging, and the entire underground world was fragmented and shaky. In addition to Yuji and his daughter, there were three other people trapped underground. No one knew that there was no one, and no one knew that their fate had come to a critical moment of life and death. Yuji used the common signal of the fire brigade-252 signal, which means that there are still survivors struggling. Shizuma (played by Uchino Masaaki) is Yuji's brother and also a firefighter. He took his team members to the collapse for rescue. The typhoon is approaching, and the boss ordered Shizuma and his team to evacuate quickly. However, at this moment, Shizuma received the distress signal sent by Yuji.