Soulmate...

Rosalie had been raised up in the world of humans though she was a witch. Her best friend- the only person close to her in this world was named Lucia Ashton.
However, Rosalie's life took an unexpected turn as she got magically bonded with her soulmate in a crowd. The bond was formed as soon as their body brushed off against each other. It left a blue bruise in her left wrist- a sign that she was bonded. The bond had been killing her each day until she found him- her soulmate.