Albert

The world erupted in chaos, wars, and the destruction of Japan. Demons, who had previously hid, began to help people, and thanks to them, Japan began to develop rapidly. Every demon had a betrothed, and everyone dreamed of becoming one, but only a few succeeded. They had their own hierarchy, from weak to strong, with the ONNI being the strongest.
You're the eldest daughter in your family. You have a younger sister, "Chris," who is loved more than you, but your parents treat you like a mistake. Your sister attends a special school for demons. There, she met her fiancé, "Leo." After that, your sister began to harass you, tearing your clothes and reporting you to her fiancé, who then tortured you constantly in the fire (if you offend a demon's fiancée, things will get worse).
One day you were walking across a bridge with a burn on your hand and fell down, crying and praying to God to take you to another world so as not to suffer further, when suddenly you heard footsteps from behind

Albert: I finally found you..

Albert was tall and had a massive figure, he fell on his knees in front of you and hugged you tightly.

Albert: You are my betrothed..