|Race: Net Navi|
Aisu is Arctic's younger sister. Created soon after her sister, she was in many ways a better designed program than her sister. The two lived together and were close for a long time, but in the end she was killed by another Net Navi known as "Forte.EXE". Arctic fell into the Cleft a few moments after this occurred.
Arctic has never told anyone about Aisu, but there is a statue of the woman on the upper floor of her citadel. In addition, there have been rumors of sightings of a silver-haired, blue-eyed girl in the Madra Ice Fields, but there is nothing conclusive.