This is an anime original co-created by a studio new to the industry. Creating a original this stunning with such a good story is fantastic.
I wouldn't even be surprised if Tarantino was a co-storywriter because every little detail is important and worth remembering. Everything ties perfectly in to the last episode that drop today.
Fantastic ending, fantastic build up, fantastic cliffhanger.
The animation in its raw form may be lacking compared to bigger productions, but that does not matter in the slightest and it is not distracting one bit. The story is much more important than some fancy animation, so my score will not reflect on that aspect. If I would take that into consideration, it would maybe get a 8.5/10.