Quinn is sent to a harsh military academy designed to filter out the weak and train humanity's future defenders. Without a registered ability, he immediately becomes the prime target for elite, high-tier students who rule the campus through fear and elemental dominance. To survive their brutal hazing, Quinn must secretly complete dangerous daily quests issued by his mysterious system, which demands that he consume human blood to grow stronger. He takes a desperate gamble, harvesting blood from injured students in the academy clinic, which triggers his first massive stat increase and unlocks his shadow-manipulation abilities. Just as he successfully conceals his vampire identity, a suspicious high-tier student corners him in a dark hallway, forcing Quinn to unleash his forbidden shadow dome to silence the witness forever.

During a mandatory military survival exercise, Quinn's class is sent through a dimensional portal to hunt low-tier beasts on a wild, uncharted planet. The routine training turns into an absolute massacre when a mutated, highly aggressive boss beast ambushes the squad, slaughtering the supervising instructors and trapping the students. Quinn is forced to lead a small group of outcasts, utilizing his superior night vision and system-assisted combat maneuvers to navigate the dark forests. As his classmates fall one by one, Quinn sacrifices his remaining blood reserves to execute a powerful high-level skill, slicing the beast in half and saving his friends. However, as the rescue team arrives, Quinn notices a high-ranking military commander eyeing the beast's unique wounds with deep suspicion, realizing they perfectly match vampire slash marks.

Quinn is secretly contacted by Vorden, a powerful student with a split personality, who discovers Quinn's secret but chooses to form a mutual alliance rather than expose him. Together, they investigate the school's underground levels, discovering that the military is actively conducting forbidden experiments on students to synthesize artificial vampire blood. To save a fatally wounded friend, Peter, Quinn is forced to make a life-altering choice: he feeds Peter his own blood, turning him into his very first vampire thrall. This act permanently binds Peter to Quinn's system, but the transformation triggers an alarm in the hidden Vampire Council, who immediately dispatch elite enforcers to eliminate the rogue creator.