The other Ultra series that aired last year, before Ultraman Ginga. While this show is called a sequel to the original Ultra Q, you don’t really need much knowledge about it to watch this. You don’t really need any knowledge about other shows in the Ultraman franchise either. Two notes under the cut.
1. Quo Vadis: Latin phrase meaning “Where are you going?”.
2. Powers Spots. This article goes into more detail about them, but to sum it up: they’re basically areas believed to possess mystical energy. More energy you collect from these spots, the easier it is to go after your life’s goals/be more lucky. While a lot of them are obviously in Japan, there’s also ones across the globe, like Machu Pichu, the Pyramids in Egypt, Lourdes, etc.
And a note of trivia: There was also a Ryuga forest/mori in the first episode the original Ultraman show, and in Ultraman Tiga’s homage to it in episode 49. I guess Tsuburaya just really likes the name.