Based on the erotic game by Bishop.

Although Souichi is an average student, his father sent him to an elite school. Treated coldly by those around him, he finds comfort in his interactions with Ayana, the only person who treats him equally, but he soon learns that she is only being kind to him out of pity. His trust turns to resentment, and this is the trigger for Souichi to realize that he has the power to control others. Using that power - the ability to take control of human bodies - he sets out to make Ayana his own, body and mind!

(Source: parabook, translated)