I'm going to start this with a content warning (which could be considered a spoiler, except it's revealed in the second or third episode, so maybe not): this series includes things that would be considered incest, statutory rape, and pedophilia in the US. I'm not 100% sure of the timeline, but the character was between 13 and 15 when the "relationship" started, and she was consistently portrayed as the seductress who started it all. Okay, now on to the review.
The Perfect Insider is an 11-episode mystery series. Specifically, it's based on a locked room mystery novel by Hiroshi Mori. From what I can tell, the novel hasn't been published in English.
I bought this completely on a whim. Right Stuf was having a really great sale, so I concentrated on the Sentai Filmworks stuff since their boxed sets are usually more expensive than I'd like. I ended up with several titles I might not have gotten under other circumstances, like this one.
The Perfect Insider stars Saikawa, a professor (of architecture, I think), and Nishinosono (who from here on out I'll call Moe, her given name, because I'm less likely to mistype it), one of his students. One of the reasons why I'm unsure of Saikawa's area of expertise is that he often had a tendency to come across as either a philosophy professor or possibly a computer science professor. I'd never have guessed his true area of study if he hadn't handed someone a business card.
At any rate, Moe has an enormous crush on Saikawa and uses his interest in the infamous Dr. Magata to entice him to a vacation on a secluded island (along with several of her fellow students and one other professor, although they're all relegated to the background for most of the series). Shiki Magata is a genius who killed her parents 15 years ago. She was declared "not guilty" by reason of insanity and has lived in seclusion ever since, continuing her research in a completely locked down apartment at the lab. Saikawa wants to meet her, even if only by video chat. However, when they arrive, he and Moe discover that Dr. Magata has been killed, her body dressed in a wedding dress and her arms and legs severed.
