When Cassandre, an orphan, is adopted by a couple, she doesn’t suspect that she just entered a mysterious world. Her parents soon give her a gift: eternal youth. But there is a price to pay for immortality, and Cassandre is not ready to submit herself to it!

Determined to limit the damage caused by this “gift,” she tries to keep a low profile in her new school, but Antoine, a classmate with devastating charm, does not see things the same way. He notices Cassandre’s strange abilities hands her a comicbook he made, suggesting that he knows her secret. Neither superhero nor vampire, who is she? Will she have to sacrifice her soulmate to regain freedom?