I think this is a classic case of a rather boring premise being put in the hands of great writers. The story itself is about as simple as you can get: another classic tale about aliens secretly taking refuge on Earth. As such I feel like I've already seen the story many times before. There's also a lot of plotholes, easily-confusing details and scenes that feel rushed. However, there are a few unique twists, and in addition the animation and actors do a really good job of portraying a mood that keeps you immersed in an otherwise shallow premise. I feel the voice actors, in particular, do a phenomenal job of making the world feel alive. Definitely interesting but only if you don't look too deep into it.