In a world where humans coexist with spiritual entities known as Anima, a select few possess the ability to form a bond with these spirits. These individuals, known as Soulbound, use their powers to fight monstrous creatures called Voidspawn, which threaten humanity. However, the balance between the human world and the spiritual realm is fragile, and the Soulbound must navigate the moral ambiguities of their powers, facing enemies both human and supernatural.