MS Asuka II (飛鳥II) is a cruise ship owned and operated by Nippon Yusen Kaisha. It was originally built by the Mitsubishi Heavy Industries shipyard in Nagasaki, Japan, as Crystal Harmony for Crystal Cruises. In 2006, Crystal Harmony was transferred from the fleet of Crystal Cruises to that of Crystal's parent company, Nippon Yusen Kaisha, and entered service under her current name. As of February 2009, it was the largest cruise ship in Japan.