Mighty Thor: Battle Royale
Genres: Fantasy
Type: ONA, Episodes: 1
Aired: Oct 29, 2017
Source: Other
Rating: G - All Ages
Synopsis:
In an alternate Azeroth, Thor and Loki have decidedly more Japanese names and face Ohera-san's (Hela) destructive wrath in what looks like ancient Japan. In reality, it's a silly short to promote the release of Thor: Ragnarok, titled Mighty Thor: Battle Royale in Japan. 

(Source: ANN)