Kotori, who possesses a voice that summons demons, was called "Lorelei," had her voice sealed, and was raised in confinement. Moreover, just before turning 17, she was sold by her biological father and younger twin sister as a "sacrifice" to fund her sister Hatsune’s wedding preparations. The one who saved Kotori on the brink of death was Kaoru, a candidate for the head of a distinguished family of exorcists. "Become my bride! I will buy your life!" A contract engagement saved the suicidal "Lorelei"!? A painful yet beautiful Japanese-style doting marriage romance begins