Chizuru-chan Kaihatsu Nikki

Spotless grades and a carefully ordered life define Chizuru Shiina, the kind of model student who has everything under control, until her uncle Tamura shows up while her parents are away and that order falls apart. What starts as an uncomfortable intrusion quickly becomes something much darker, as he uses a childhood promise to manipulate her into a situation she never agreed to and can't easily escape. The series tracks how that coercion unfolds and what it costs her, both emotionally and in terms of the composed, put-together life she's worked hard to maintain. Don't go in expecting anything light; this is a 6-episode OVA from T-Rex that leans fully into uncomfortable territory, built around psychological manipulation and explicit content. The character work is more considered than you'd expect from this genre, and the tone stays consistently unsettling rather than drifting into fantasy. If you've watched Kuroinu or Shoujo Sect and want something with a more grounded, character-focused framing, this sits in a similar space. It's not for everyone, and it's genuinely not trying to be. Based on the manga, it adapts the source material closely and doesn't soften the edges. Approach it knowing exactly what it is.