Metronome

A bloodstained man stands in front of a terrified girl. He proclaims his love for her and makes this ominous declaration: A year from now, she will either die alone or will be with him forever. Now, rumors abound about the cursed girl that causes any boy who proclaims his love for her to die. Join us to discover the mysteries of Metronome.

Metronome is originally a webtoon series which was published in book format by Balhae (발해) on August 14, 2012.