This was a very enjoyable, if not overly brief, endeavor and I would highly recommend giving it a try.
Animation:
The animation style is a bit unique in this series, and will definitely take a little getting used to. There are many scenes where you can tell they were on a budget, including randomly panning to a really freaky looking mannequin that will forever haunt your memories. There are also moments where the series loses a bit of sharpness, and a few camera angles that "save" the viewer from some of the more grueling discoveries.
These aside, the animation is fairly well done. To start, there is vivid use of color the influence the mood of the situation. Furthermore, all the characters have unique styling; I particularly liked how they made use of Ame's hair throughout the series. The OVA does contain a decent amount of blood and some highly suggestive scenes, as well as a fair amount of action. The fights are a few levels below what you'd find in Kara no Kyoukai, but mostly because they're typically very short and don't make use of magical elements (and don't have the talent of Kalafina to back the animation).
Sound:
The series only has two EDs, one per episode, which vary from meh to fairly good. The BGM is very ambient-based and is used very effectively when present. It isn't anything as grand as Yuki Kajiura but has a unique feel due to it's use of percussion and a (traditional?) banjo/guitar.
The VA list is quite impressive with many huge names voicing supporting characters. The mains aren't bad either. Juu is voiced by the human dude (similar personality) in Level E and Ame's VA has a quiet feel that matches her personality very well.
Story:
This OVA is a perfect example of how to do short pieces well. It provides decent background information while also telling a surprisingly intricate story, all while pushing through some really sharp plot twists to keep you on edge. It also does so without leaving the viewer in a WFT state, which so many short OVAs end up doing.
This series is similar to Kara no Kyoukai because of the murder/mystery context, and discovering how twisted human nature can be. That being said, I hope the world is a bit more kind than the one depicted here as there are way too many people who are a bit unstable. I'm also a little confused at how Ame has friends who can easily break a deadbolt.
There are a few plot holes and unnecessary sacrificial moments by Juu but all and all the story is well done, especially considering the length.
Character:
There isn't too much exploration here, given the focus on the story and plot line, which is one of the primary reasons why the viewer will probably want more once they finish watching. The Ame-Juu relationship is just starting when the show finishes and it just feels like there's so much more untapped potential in this series.
Value:
There are few shows that match the excitement and intrigue of this series that also fit into this length category. It truly is a very entertaining watch, and one that actually has re-watch value as well.
