As a fan of the original Manga and the more recent Anime, I started watching this series with expecting to be let down.
Instead, not only I really appreciated the fresh take and the cast of characters, but the visual effects and general direction of the story are very high quality. It also kept the important soul of the original story, which is giving importance to the real plot of the story, about human condition and the relationship of humans and their environment.

Overall it left me with a very positive message and wishing for a season 2 asap. You can watch this even without knowing the original story, I'd even say it will leave with wanting to know more, so you might check out either the original Manga, the Anime, or even the recent Japanese movies. I can't wait to see more, what a nice surprise this was!