Overall
Without ever reading the manga, Overall, I have to say that it was definitely enjoyable and I would rewatch again. If you think the topic is to weird or triggering please don't watch, but if you think it sounds interesting, by all means, give it a try.

Story
Honestly, this is the first time I see something like this. I am sure that there are more out there but it is my first. I think that the plot was good but there was so much that was never explained at all. Who was that group of cleaners? Never really got an answer. In the end, I just ignored all that because I was really enjoying it for what it was, but I know that there is a lot to be explained.

Acting/Cast
The main cast was amazing as always. It was great to see Sugino Yosuke and Fukuhara Haruka act together again. I really enjoyed them in the second season of Good Morning Call and also in their other works. Both are great actors and There can't be much said about them other than how great they are.

Rewatch Value
I would definitely rewatch.