It's from an Ultraman series (tokusatsu/Japanese superhero show),
The clip features a large, monstrous creature (often with a big belly/pregnant-looking design in some episodes) that appears scary but shows a gentler or protective sideβcommon in Ultraman stories where kaiju (monsters) can have sympathetic or non-evil traits. The video includes fight scenes, Ultraman battling/posing, bubble/egg-like elements, and victory celebrations with civilians.
These kinds of "scary but kind-hearted monster" tropes appear across the long-running Ultraman franchise (many series/episodes). The exact episode isn't immediately clear from the post, but it's classic tokusatsu footage.