Shh! Don’t Scare Her

There is a monster inside him. She only appears when he's hurt, and invites him to dance wildly in the abyss, while all he wants is to escape this damned new hell.

“How cold of you.”

This damned world, you and me, all damned.

The author isn't very good at writing blurbs, so please bear with this one. There's one female lead, though she might not really count as a female lead. There's not much of a romance plot.