Ep. 1: Blood Legacy epidemic kills adults, leaving children vulnerable to vampires before a risky escape attempt.

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An unexplained epidemic strikes humanity, resulting in the death of every adult and leaving the younger generation at the mercy of vampires. Four years after this catastrophe, Yuuichirou Hyakuya and his companions execute a bold plan to flee their captors. They proceed with the mission under the false assumption that their path to freedom is clear. However, they are completely unaware that a deadly trap has been set for them, turning their desperate bid for liberty into a perilous confrontation with their enemies.