Interesting plot, and twists, throughout entire season. Wondering and predicting where they go from here in the next season. Currently I rate it quite high, but subsequent season(s) will determine if my opinion remains high.
Arisa, herself, is actually quite believable, although some tech used in the show isn't. All the main human character(s) are portrayed well and their flaws (humanity) are, for the most part, believable as well. The cinematography is also well done.
Worth watching, at least the first season. Waiting to see the next.