The SoulTaker - S01

Kyousuke Date returns home one night to find his mother lying mortally wounded in her own blood. With her dying breath, she stabs him in the chest. After recovering quickly, he sets out to understand why she attacked him-only to be caught in the crossfire between two warring factions: the Hospital and the Kirihara Group. To his shock, Kyousuke learns he has a twin sister named Runa, though he has no memory of her. Both groups press him for information about her, despite his confusion. As their relentless attacks escalate, Kyousuke realizes something even more startling-he can transform into a monstrous mutant known as the SoulTaker. Armed with this power, he vows to destroy the organizations hunting him, unravel the mystery of his mother's final act, and shield Runa from harm.