Thanks to WARLOCK360100 for this one.
Hello everyone,
according to this article, Wargaming (specifically Viktor Kislyi) announced at the Tokyo Game Show 2014 that Wargaming (World of Warships) would cooperate with the creators of anime called Arpeggio Blue Steel, which is apparently warship-themed. Tried to check on the story of the anime and it makes no sense to me, so I guess it’s an attempt to make specifically the Japanese players interested.
Well, at least they are doing the advertising right: