This is a trailer for Force of Will, an anime adaptation of a card game (of the same name) that’ll be out in 2018.
An anthology of six short films (think The Animatrix), Shuhei Morita (Possessions) is directing this Cthulu one that the trailer below focuses on, which is pretty neat.
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Other shorts (also based on the card game) will be focused on stuff like The Monkey King and zombies.