Friends or Enemies

In Aincrad , where its people fight to survive ; Prince Kirigaya Kazuto Lives on the 100th floor in his castle faraway from his people . His bodyguard Yuuki Asuna having a hard time stopping him ,every time he sneaks out of the castle .
Underworld , a land near to Aincrad , people live their lives peacefully . While the normal people don't know how to fight , some of the wealthy and high rank people learn the art of sword fighting . It is the same for Prince Eugeo , heir to the throne of Underworld , whose personal room is on the 100th floor of central cathedral .
100 years ago , before these princes were born , a war started between the two lands of Aincrad and Underworld . A war that lasted for years and have not ended yet .
Despite the war Kazuto and Eugeo become friends and want to keep their lands in peace but ...