Announced a couple of days back, the Japan server for Mabinogi Heroes will be collaborating with hit anime and light novel, Sword Art Online, for a limited period. This is not just any marketing gimmick, as the characters are actually part of the game content, including exclusive quests.
Of course, costumes related to the main characters such as Kirito and Asuna will be on sale in the cash shop as well. This is not the first time Nexon Japan has teamed up with Sword Art Online for their titles, and sadly all these content will never see a release in the English versions.