During the Pacific War in July 1943, the U.S. military attacked the Japanese soldiers stationed on frigid North Pacific Ocean islands. As the last landing craft departed, it was damaged and started to flood. Commander Maj. Serizawa requested help from Matsumoto Ju Cao Fei, who was assisting wounded soldiers, to go back to the island and lighten the boat. However, one of the soldiers beat up Sono Serizawa instead. Captain of the Asahi Matsumoto faced charges of rebellion and disobeying a superior officer if he returned to Japan but jumped into the sea and went back to the island himself. Asahi chose to stay on the island to save the boys.
After 16 years of searching, Asahi was found frozen in a cave on the island. With the help of modern medicine, he was successfully revived. At first, he looked for meaning in his life in the prosperous city of Japan and tried to self-determine, but he found purpose in publicly defeating a motorcycle gang without a report. He believed that "mind instead of the rich became poor" and searched for a more meaningful life. Chairman of heavy electric machinery and successful businessman, Matsumoto, joined forces with Asahi and became a co-teacher at a middle school where he previously failed.
The Matsumoto campus was covered in graffiti, and most windows were pierced with a flashy deformation by Yankee students wearing student clothing. The boss of the fifth school in Matsumoto, known as the "hands of God," was the most problematic among these students. Asahi led the only other group of troublesome students, called "Group Z." Their education and upbringing made them stand out.
