I haven't had time to watch any of this until now. It's OK, but I just realized that she's got a Mesousa face all the time. Add the chibi rendition, and, well... Perhaps Shinbo ran out of ideas for this one.
Not really what I was expecting. With a title like Denpateki na Kanojo, I was thinking more along the lines of that girl from Fruits Basket. But no, this is a Serious Business serial murder mystery. High production values, as expected for an OVA. Overall impression: a little original, a little vague, a little cliché, with a nice twist. As consolation, I will accept violent imouto with spats.