Akuyaku Kizoku ga Hirakinaotte Hametsu Flag o "Jitsuryoku" de Tatakiotteitara, Itsunomanika Heroine-tachi kara Eiyuushi Sareru you ni natta Ken

I found myself reincarnated as the villain in a game called "Kaleido Lily Academy." The villain in question—Ix Vandille, the heir of the Count's family—was a typical scumbag. Hated by many, he was condemned and killed in every scenario set in the academy. At this rate, I would die as soon as I entered the academy. However, my bad reputation knew no bounds, and it was too late to reform myself now. Therefore... "That's it! If I become stronger than the protagonists and show them my power, they won't dare to oppose me...!" To avoid being killed by the protagonists, I must become stronger than them. If I display my power, they won't think of making a move against me. And if they do, I will just defeat them. With this resolve, Ix spent the three years before the academy began training desperately. "...Master, your strength is unmatched by anyone your age now." "Hahaha! This is all due to my perseverance!" Ix became stronger than the protagonists. And soon, he began to show his strength to the protagonists, the heroine princess, noble daughters, and saintesses... but for some reason, he started being regarded as a hero.