Seishin Seiai Paraphilia

A shy and gloomy man does the girl of his love in his mind.

Souta is aggressive in his nature, but outwardly he behaves weak and awkward. Having no friend, his favorite place in his school is the school library where he can see Izumi from a distance.

One day, when he went to the library as usual, his eyes chanced on a book that was left open on a desk.
The book has a mysterious power to slip into the mind of others.
From that night, he starts diving into the mind of Izumi to savor and destroy her from within...

[From DLsite English]