Hiai Mosou is a manga with an interesting stalker horror story about a woman obsessed with her teacher.

However, the problem of the show is that it suffers from a notable identity crisis. It feels like the writer could never decide whether it wanted the story to be a horror story or a sexy fanservice fest, the result is a erotic thriller in which the eroticism cancels out the thrill and vice-versa.

It's hard to be excited seeing a naked girl if you know she is dangerous and insane, at the same time that it is hard to take her seriously as an antagonist when she is freely used for over-the-top fanservice later.

Erotic horror is a genre that actually exists and can be pretty effective, but the manga can never wholly capture it for lacking a proper balance between these two elements. One of the major problems I feel is that a few of the fanservice scenes are played pretty straight for fanservice, even when they are actually portraying a terrifying situation that would be categorized as sexual assault in the real world and that assault and invasion of privacy also being used as the cornerstone of the horror of the manga ultimately cancel out each other.