Limbo

Aurora Edelweiss, nearly 16, can see the spirits of the dead and interact with them.
She uses her power to investigate paranormal phenomenons, notably mysterious objects named "soul's essences".
One day, during an investigation, she's attacked by a monster and saved by a stranger, but is projected in the Limbo during the attack. She then discovers the truth about "soul's essences".

(Source: Editorial Planeta, edited)