Reincarnated in a depressing erotic world but living a normal life (right?)

 "I have no name, or rather, I don't need the name that filth gave me, whom I don't even consider family. I lived a miserable life, harassed by them, even at school I was an outcast just because of my delinquent appearance. Nobody believed what I said, not even when it was true. I was on the verge of suicide, until someone contacted me. She was beautiful and had it all, popular, from a wealthy family, she was perfect. I ended up falling in love, wanting to improve to confess my feelings to her. I strived, improved my grades, my relationships, and even my attire, all to be worthy of her. But, as a cruel joke of fate, she chose a complete stranger with nothing remarkable... Why, why, why, why, why? TELL ME WHY, LILITH!!! What does he have that I don't?! UNFORGIVABLE! Furious, hurt, and betrayed, I lost all motivation to improve, and my grades worsened, as did the few relationships I maintained. The building deteriorated, all because of her! I will not forgive the woman who abandoned me or the man who took her away from me! So, through dubious contacts with the city's underworld, I obtained a special medicine known as the 'possession drug,' which allows the user to become a ghost to seize and control another person's body, numbing their original consciousness. With this, I can take my revenge! I gave it all to get it, caring about nothing. With nothing, no family, no friends, no love.

ALL THAT REMAINS IS MY REVENGE."