Reincarnation Turns into a Vicious Perverted Woman Who Kills the Male Protagonist

Abnormality + madness + morbidity + imprisonment + humiliation + fine points + yandere + reversal + cool writing The female protagonist looks like a white flower, but in fact she is bound to a vicious and perverted yandere. She approaches the male protagonist just to kill him and become the only protagonist. The male protagonist is sickly, suspicious, ruthless, and scheming. He uses his stolen identity to plan step by step, murder, imprison, and repeatedly suffer mental torture. Both of them are the ultimate lunatics, who is better? Who will die in whose hands?