Gate

Gate is also listed as GATE: Jieitai Kanochi nite, Kaku Tatakaeri on some trackers — same show, different title convention. It's a TV series across 12 episodes out of A-1 Pictures. It's finished airing, so the whole thing is watchable start to finish.

Genre-wise it's tagged Action, Adventure, and Fantasy, which is the throughline if you're browsing by mood rather than by name. Liked it? The related picks below start with Attack on Titan, pulled from the same genre lane.