Yandere Karyuki Nympho

An orphaned girl at a night school falls in love for the first time, and it wrecks her. Karyuki starts out innocent, but once she decides she has to win the boy who caught her eye, she'll sell her body and cross whatever line stands between her and him.

The story tracks that fall in real time: affection curdling into obsession, obsession into depravity, until the sweet girl from the opening scenes is unrecognizable. It's framed as a question rather than a warning: how far would you go to be loved, when love stops looking like love at all.

You follow Karyuki through that descent rather than steering it from outside, watching her romance shade into manipulation, harassment, and worse as her sanity goes with her innocence. The school setting stays constant while everything underneath it rots.