English version

8 Eyes is set in a post-apocalyptic future. Mankind is recovering from hundreds of years of chaos and nuclear war, and civilization is being rebuilt by the Great King, who harnesses the power of eight jewels. The jewels, known as the 8 Eyes, were formed at the centers of eight nuclear explosions that came close to destroying the Earth. The 8 Eyes have mysterious power which, in the wrong hands, could bring about the end of the world. The Great King's eight power-hungry dukes steal the jewels for themselves and banish the King to the nuclear wastelands, threatening to once again plunge the Earth into war.

The player controls Orin the Falconer and his fighting falcon Cutrus. His mission is to infiltrate the Dukes' eight castles and retrieve the 8 Eyes. With the help of Cutrus, Orin must fight the Dukes' soldiers, nuclear mutants, and the duke of each castle to retrieve the jewels. After the jewels have been recovered, Orin must return them to the Altar of Peace so that the Great King may return and finish rebuilding the Earth.

Japanese version

The Japanese version of the game is set in the Balkans in the late 19th century. The Ottoman Empire, which had barely survived due to the power balance among the great European powers, was beginning to feel the shadow of its survival. The seeds of various conflicts, which had been so densely packed that it was called the "Powder Keg of the Balkans," were now igniting all at once. Terrorism and assassinations of important people by the Free Armenian Army were already commonplace. With the dignity of the government in turmoil and pessimistic rumors and speculation abound, an incident occurred that made restoring public order the most urgent task for the British Empire, which had Ottoman Turkey as its protectorate.

A research team was sent by the British Museum to investigate some newly discovered ruins. However, the entire team was brutally slaughtered, with their heads missing and their stomachs cut open. All of the artifacts they uncovered and their excavation journals were stolen.

The perpetrator of the murders was a group led by Ruth Grandier, a female bandit known for her demonic worship who claimed that she and her group were fallen children of Lucifer. The College of Arms learned that Ruth's group stole artifacts that concealed demonic secrets and could be used in a dark ritual to resurrect demons.

In order to stop Ruth, the College of Arms Seventh Division (which would eventually become the MI5) decided to send Baronet Sir Julian James Bond, the greatest swordsman in all of England. Sir Bond infiltrated the Balkans along with his pet eagle, Cutlass.