The Witch And Another World Girls

He cannot remember anything of his past life, not even his name. He can't even remember the details of the novel he's been reincarnated into. All the newly-awakened Vanitas Lindblum does remember is that he's been cast as the villain in this world—and that by the novel's end, he's doomed to die.

Determined to avoid that fate, he undertakes learning the ancient skill of Grasping Magic, which not one of his foes is able to wield. Along the way, the women enslaved by the evil Vanitas—destined to become the hero's right-hand women and overthrow him—are instead allured by this change in his personality and begin to...admire their new master? Can the antagonist cheat death and even find love?

(Source: J-Novel Club)