>>2813112You can play it on Google Chrome:
http://granbluefantasy.jp/en/download/I don't know how events work on Granblue Fantasy, so you'd have to look it up to see if you can even still get Koume's unit. Mostly to see if the event is forever on-going or if it only appears every few months or if it was just a one-time thing.
Some anon here probably plays it though and has the answers.
