User blog comment:Kanata Tokiwa/My 9th Urashima Kotetsu.../@comment-26093926-20150907185722

Emas were renamed to Ofuda after the July 10th update after the game ran into some legal issues. The July changelogs, here http://pastebin.com/3GLFFMBa, has information about the update and provides links to further information on why the change happened.