Kieli, Vol. 1 (light novel‪)‬

Kieli sees ghosts. It's an odd ability for a 14-year-old girl, and it
makes her a bit of an outcast at her boarding school. Her only friend,
in fact, is the (semi-) departed spirit of a girl who used to inhabit
her room. That is until the two encounter a young man who appears to
share Kieli's "gift." It doesn't take long to discover, though, Harvey
is an altogether different sort of creature - one of the infamous
Undying, the reanimated corpse of a dead soldier. Could it be that in
this cursed fellow Kieli has finally found a kindred spirit? Throwing
in her lot with this strange, soulless man and his possessed radio, she
means to find out...