From Selene Scans: The story focuses around Arisa, which only started high school. Her first day at school, who also coincided with her 16th anniversary, was rather catastrophic. Aris was absolutely empty, and when she returned home, she heard her parents argue. He learned that his parents actually demon and angel! Her mother, an angel, explained that she and her father, the devil, fell in love and got married. Aris is actually half demon and half angel. Because of this, she cannot control their strength and should find his true love. According to his mother, she can track it, following the red threads that bind them together, but Aris discovers that his threads were cut, and he should find him in the old way!