Ero Academy - Chapter 681 - 809 – Four Heavenly Kings

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

WARNING: MATURE CONTENT!Ahmet's laughter was like a slap in the face. “You think you're in a position to negotiate with me?” he sneered. “I don't think so, Asli. You'll do what I say, or suffer the consequences. Do you want more time to outsmart me? No.”She could play his game. She certainly could do that before she finally killed him. A mischievous grin formed on her lips. “What would you gain from sleeping with me?” she asked, trying to keep her tone neutral. “You're not exactly known for your romantic conquests. And we're rivals, not to mention the fact that our families would kill us if they found out.” She paused, her eyes narrowing. “So, what's the real motive here? What could you possibly gain from this?”There was a pause on the other end of the line, and for a moment, Asli wondered if she had caught him off guard. But then, Ahmet's smooth voice came back, dripping with confidence. “I’m glad to know you are well-informed about my romantic conquests. Let's just say, Asli, that I have my reasons. And as for what I'd gain… well, that's for me to know and you to find out.” His tone sent a shiver down her spine, and she knew she had to tread carefully. She wasn’t going to win this against him.“Show me what proof you have and I will give in to your demands.” With that, she hung up the call, feeling a small sense of satisfaction at being the one to end the conversation this time. She was the only woman in the male-dominated Mafia world. Did he think he could subdue her so easily?

Kōdo Ikusei Senior High School, a leading prestigious school with state-of-the-art facilities where nearly 100% of students go on to university or find employment. The students there have the freedom to wear any hairstyle and bring any personal effects they desire. Kōdo Ikusei is a paradise-like school, but the truth is that only the most superior of students receive favorable treatment.

The protagonist Kiyotaka Ayanokōji is a student of D-class, which is where the school dumps its “inferior” students in order to ridicule them. For a certain reason, Kiyotaka was careless on his entrance examination, and was put in D-class. After meeting Suzune Horikita and Kikyō Kushida, two other students in his class, Kiyotaka’s situation begins to change.

My childhood friend went to the academy.