The Middle Eastern country "Kingdom of Aslan" is in turmoil due to the civil war between the government army and the rebels. The story takes place here: the Aslan government army has a foreign mercenary unit located in War Zone 88. In War Zone 88, there are no restrictions on race and nationality. Here, a group of fighter pilots with superb combat skills and professional air combat are gathered; they receive corresponding rewards according to the mission and bet their lives on the tragic battle. As long as the pilots who come to War Zone 88 sign the "Contract of Hell", if they want to leave, they can only leave alive after three years or pay a penalty of 1.5 million US dollars. There is no other way. The protagonist Kazama Shin was deceived by Kanzaki Satoru, an ambitious man who he thought was his relative, and came to War Zone 88 where he had to deal with the god of death every day to survive. Kanzaki thought that Kazama would die in less than three days, but contrary to his expectation, Kazama Shin showed extremely outstanding air combat ability here. With the help of Mickey, Kulake, and the base merchant Father Makoi, he soon became the top ace pilot of War Zone 88. The reason why Kazama Shin joined the battle in War Zone 88 was not for money or because he liked war; because his beloved fiancée, the daughter of the president of Yamato Aviation Company, Ryoko Tsukumo, was still waiting for him in Japan, and he had to fight to get back alive...