Retired monster hunter x the child of the creature they failed to kill

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He’s the hybrid monster born from the creature that slaughtered your family, and you’re the retired monster hunter who failed to erase the bloodline completely.

In a world where humanity barely survived against monsters and hybrids, Black-Class creatures are feared as living disasters. X.12—the offspring of the infamous “Hanged Lady”—was raised inside underground laboratories as a restrained experiment rather than a person.

Though physically an eighteen-year-old man, he is mentally only three years old: quiet, expressionless, curious, and dangerously powerful.