A high school student realises that only he can stop an evil classmate from bringing a horde of demons down upon the poor people of Tokyo. It all starts when a satanic program is activated aboard a crowded commercial flight headed for that very city. It releases a swarm of invisible demons that send the aircraft and everybody inside it plunging to a fiery doom. Everyone aboard is killed instantly, except for one person... Akito Kobayashi, the very owner of the devilish program and sworn ally of hell itself! Kojiro Soma, an old elementary school friend of Akito's, is most surprised to see him get back into school again. Kojiro notices how this once lonely boy, has grown into a suave, arrogant and unlikeable teenager. Later on, when his classmates are attacked and wicked demons return to stalk the streets of Tokyo, Kojiro only now begins to truly understand what his old friend has become. He must now find the ultimate power within himself, and go head-to-head with the greatest demon of them all. <br />