The animation is so bad. The characters are in 3d, they are stiff AF, (they barely even blink) and it looks like a cheap mobile anime game.

The background characters are in 2d and the main ones are in 3d which makes no sense.

The animators probably have no experience in this. It looks like they have no experience at all.

The side affects are also pretty bad. If the anime was as epic as the poster it would actually be a bit good.

Literally if you want to see this then read the manga, you don't want the anime to curse your eyes.