“Can we truly call someone who has lost their soul a human being?”

Izuki Tsushima, stripped of his soul and tainted by the blood of monsters, is a living hybrid who hunts the very monsters that drove him to ruin. During the dark Meiji era, where victims are transformed into monsters, Izuki fights not only to survive but also to annihilate every single soulless being—even if it means losing what little humanity he has left.