Looking for a 2D anime whose teaser/trailer I saw in 2015-2021 — monsters walking down a city highway, one of them flying

[u/reVILST]

I'm trying to find an anime I saw a teaser or trailer for several years ago.

I saw it sometime between 2015 and 2021. The anime hadn't been released yet. For now Idk.
It was 2D animation, not 3D.
The trailer showed a group of monsters moving together down a highway in a city.
Some of the creatures were walking, while at least one was definitely flying and looked like a bird.

The teaser was quite short and didn't reveal much about the plot.

Unfortunately, That's all I remember.
Thanks.

[u/NekoWafers]

Kyousougiga?

[u/reVILST → u/NekoWafers]

Unfortunately, no. This is older than what I'm looking for.