Death Hunter's Requiem

Jounoichi "Joey" Nakahara only lived for the act of 'normalcy' for most of his life, the only thing preventing that being the mysterious medical condition he developed after a traumatizing attack at a young age and escaping home with his older brother. However, when he suddenly gains the ability to hear other people's thoughts and is attacked by a vicious monster known as a Tergiversator, his life changes forever. Stuck with this power and the encounter of the illusive Ashino Aurion, he must unravel these secrets of their past and become a Death Hunter.

But the question is, "What IS a Death Hunter?"