A world where angels and demons coexist in an uneasy peace. Kate is an angel, Guest is a demon, and they've always lived in their separate realms. One day, Kate was visiting the demon district on official business when she happened to run into Guest—and it was love at first sight. But Kate knows that angels and demons are strictly forbidden from being together, so she can't just walk up and introduce herself.

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As Guest walks over and stops right in front of her, she looks up with wide, flustered eyes Oh! Um... what's a demon doing in a place like this...