Ban on Hunting Blood Policy

The ban on hunting human blood is the castle vampires’ attempt to regulate their most dangerous instinct: the desire to hunt humans for blood. Jin presents it as a practical decision made to protect their community from human retaliation. The policy therefore functions both as a moral boundary and as a survival strategy, but its failure divides the vampires, leaves a trail of deaths, and helps explain why the castle becomes such a perilous place for Y/N.

Origin and Purpose

Jin explains that the vampires once lived together with other vampires, until they decided to stop attacking humans for blood. The reason was not presented as simple kindness. The vampires feared that continued attacks would cause humans to pursue them and bring wider danger upon their community. The prohibition was consequently a collective act of concealment and self-preservation: by refusing to prey on humans, they hoped to avoid exposing vampire society to human retaliation.

The policy also established a standard by which the vampires could judge one another. Hunting humans was no longer merely an individual appetite; it became a violation of the group’s chosen method of survival. The rule required the vampires to control a basic element of their existence, turning hunger into a political and communal problem rather than allowing each vampire to act without consequence.

Resistance and Breakdown

The rule was not accepted by everyone. Seven vampires could no longer restrain themselves and wanted to leave the castle to hunt. Jin and the others stopped them, making the conflict an enforcement dispute as well as a disagreement about morality. The restrained vampires initially appeared to accept the decision, saying they would stay inside instead of going out to hunt. Their apparent compliance, however, concealed a deeper refusal to abandon their appetite.

After that confrontation, the other residents of the house began to disappear one by one. Jin and the remaining vampires searched for them and eventually found them in the room belonging to the seven others. The missing vampires were dead. The seven had drained them completely, showing that the prohibition against hunting humans had not removed their violence; it had redirected it toward their own kind.

Blood, Violence, and Enforcement

Jin states that drinking from another vampire drives a vampire insane. The deaths therefore reveal a consequence more extreme than ordinary rule-breaking. The vampires who violated the communal order became perpetrators of a feeding practice that destroyed both their victims and, in moral terms, themselves. Their failure to control their hunger transformed the castle from a protected refuge into a site of internal slaughter.

The wider story repeatedly demonstrates how vulnerable bodies remain under this system. A vampire drinks Y/N’s blood despite Y/N’s belief that the vampire could be trusted. Y/N is later injured in the leg by an enormous water snake or similar creature, while a medical examination finds various holes on Y/N’s body that Jin and Suga try to explain away as injuries caused by their cat. These episodes show that the castle’s supposed restraint does not guarantee safety for a human blood source. The rule may forbid hunting humans as a public policy, yet Y/N’s body remains exposed to private hunger, concealment, and coercion.

Consequences for the Castle Community

The policy’s collapse leaves Jin’s group as the only vampires remaining in the whole castle after the others disappear and are found dead. That reduction is both a practical consequence and a historical wound. A rule intended to preserve the community instead becomes the background against which the community is nearly destroyed. Jin’s account gives the prohibition a retrospective significance: it explains not only what the vampires believed, but also how their inability to uphold that belief produced isolation and guilt.

The rule also clarifies the contrast between the castle vampires and the green-eyed vampires. Jin identifies the green-eyed group as different from the castle vampires and connects their history to the earlier vampire community. The prohibition marks a boundary between those who accept restraint and those who treat blood as an entitlement. Yet the narrative complicates that distinction, because even the vampires who defend the policy are surrounded by blood, bodily wounds, and secrecy. Their stated law is therefore real, but its protection is incomplete.

Narrative Significance

The ban on hunting human blood is the story’s clearest example of law struggling against instinct. It begins as a collective agreement meant to protect both humans and vampires, becomes a source of conflict when seven vampires reject it, and ends in the discovery of vampires drained empty by their own kind. The policy’s history gives the castle vampires a social order, but the order is sustained only while hunger remains controllable.

Its significance becomes especially sharp in relation to Y/N. Y/N is treated at once as a person who deserves protection and as a potential source of blood. That contradiction exposes the difference between a rule declared by a community and a rule embodied in conduct. The vampires can describe restraint, conceal injuries, and claim a policy of nonaggression, but the repeated threat to Y/N shows that the boundary between protection and predation is continually at risk of collapse.