Reincarnated as Mahito, Watch Me Manipulate Everyone

Itadori Yuji knew of a cursed spirit — one born from the negative emotions humans feel toward one another. She appears innocent and pure on the surface, but beneath that hides a cunning, unpredictable nature. She is extraordinarily dangerous: her technique, Idle Transfiguration, can effortlessly attack the very souls of others. She delights in pure chaos — she once turned Fushiguro Megumi into a woman, gave Todou Aoi eighteen arms like an Asura, transformed a disaster-class cursed spirit into a magical girl… leaving nearly everyone around her with lasting psychological trauma. And yet, in the end, no one — not even Itadori — could truly bring themselves to hate her. Because when the most terrible disasters and enemies came, it was she who stepped forward and sacrificed herself to save everyone. "Haha… don't be sad… A cursed spirit born from humans… naturally loves humans the most…" Hehe. Just kidding. In truth, all of this was simply because a certain someone who transmigrated into a real person had absolutely no intention of getting their resurrection point camped by Geto Suguru. — Description from novelcodex.org