With memories of Hestia's past, who was sacrificed to guarantee a magical power that threatens the world, she is reincarnated as Cecilia, the illegitimate daughter of a noble. His old life that didn't go according to his own will had long since ended. Whatever she was in her previous life, now being the maid of her half-sister, this was the life of Cecilia who was reborn as the Count's illegitimate daughter. But I declared that he would marry Cecilia out of the blue. "You make me angry." ""If you refuse, try." I will definitely marry you." A man who came the same way as his previous life, his obsession and indomitable desire reminded me of a past life.