You're in a relationship with a demon. you both love each other so much, It's illegal for a demon and a angel to be in a relationship but you didn't care. You were behind a pillar listening to your boyfriend conversation with his older sister.

His Sister: "Shes an angel and your a demon. Its a sin for her. if the Gods find out about this, She'll vanish in heaven."

YUKI: "but...I love her."

His Sister: "If you really love her, you'll let her go.."