Toshiwasure Guda Guda Order 2016
English name: Farewell to 2016 Guda Guda Order
Genres: Comedy
Type: Special, Episodes: 1
Aired: Dec 31, 2016
Studio: TROYCA
Source: Game
Rating: PG-13 - Teens 13 or older
Synopsis:
Oda Nobunaga will join the fight for "GUDAGUDA Honnouji" that suddenly appears at Chaldea! This event features an original story written by none other than the one with a super confusing pen name, Keikenti-san! Of course, the scenario was (basically not) supervised by Kinoko Nasu!

(Source: Fate/Grand Order Wiki)