On Wednesday, when I gave my classmate Rei a stimulant, she turned into a girl craving for sex, always wanting to be close to me. Rei is an innocent student from a wealthy family, but she already has a boyfriend.

However, I couldn't stop my heart from falling in love with her. As a Pharmacy student, I always feel my heart flutter whenever I see Rei. The desire grows stronger, and I am determined to help her forget her boyfriend and step into a new world.

I invented a stimulant from dangerous compounds that I took from outside the school. When Rei took the drug, she became passionate and began to crave. "I can't take it anymore... without this drug, I feel like I'm going to die," Rei said, her eyes sparkling with desire.

Seeing her in a state of ecstasy, I knew my plan was working. But am I going too far in this game? Rei's life will change forever, and I am the one behind it all.