Toukenranbu 刀剣乱舞 -ONLINE-, Known as Tourabu, is Japanese browser strategic game created by DMM games and Nitroplus. As it has been announced at Anime Japan 2016 there are 2 anime series based on the game.
Here is the latest 30 second PV created by Ufotable the anime company created Fate and Tales of Zestiria series.
TV Animation Toukenranbu
(C)DMM GAMES/Nitroplus (C)ufotable