Donten ni Warau Gaiden: Shukumei, Soutou no Fuuma
English name: Donten: Laughing Under the Clouds - Gaiden: Chapter 2 - The Tragedy of Fuuma Ninja Tribe
Genres: Action, Supernatural
Type: Movie, Episodes: 1
Aired: Jun 9, 2018
Studio: Wit Studio
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
Fuuma ninja clan is a secret ninja tribe that is waiting for the "Orochi" (gigantic snake) to resurrect for generations. Shirasu and his twin brother Ichiu grew up in this viscous environment and this tells how they become the leaders of the clan.

(Source: Amazon Prime Video)