Soushinjutsu Gaiden ~Ayakawa Hakase no Hentai Jikenbo~

The main character, Hajime, has a somewhat uneventful life, until he catch the eye of Haruki Ayakawa, another student, a bit on the crazy side, that will throw him in the world of mind-controlling.
Unless he makes a wrong choice that bring him back to a boring life, he will go further and further in this world.