Well animated, yes. For its distinct style of cute-vice-grotesque.

Story? It's very light on that. There's not really a cohesive plot. Just a few related/remembered prior events. It's Miko suffering from her "condition" and trying to do her best to not be killed by a ghost recognizing she's seen them.

But in contrast, the lore is pretty good. It's not entirely scary shit she sees.

My favorite OP/ED this season too (though Mushoku Tensei's OP is good this season, ARIA style in-world).