Crown of Thorns (いばらの冠, Ibara no Kanmuri) is a shojo manga by Yoko Kamio. It began its serialization in April 2013 in the Bessatsu Margaret magazine, and ended in March 2014. It is complete in two volumes. Viz Media has licensed it for digital release in English.
The standoffish Nobara has always been able to see things that others can't. But lately, she's been seeing the ominous specter of a young man. What's more, when he speaks, she recognizes his voice as one that she's heard in her head for most of her life. Just who is this man, and what does he want with her?