A kid's hero worship collides with the actual cost of being a hero. Ember City isn't waiting for him to be ready, it's already burning, and the people he idolizes are bleeding out trying to stop it. By the time he understands what he signed up for, he's already made choices that can't be unmade.
Yeyu arrives in Ember City carrying a dream: to become a Hell Hunter like the heroes who once saved his village. The moment he steps off the bus, he finds an unconscious woman bleeding in an alley and does what any decent person would do,he helps her. What he doesn't know is that she's MIKO-Taiyi, a bioengineered operative working for Lucifer, sent to infiltrate the city and steal classified intelligence. By bringing her to the Hell Hunters' base for treatment, Yeyu accidentally takes possession of her mission device. Now he holds something that could topple the organization he's desperate to join. As Yeyu begins his trial with the Hell Hunters, the city spirals into conflict. Taiyi awakens with fragmented memories and her own agenda. Yeyu must navigate his new life, the dangerous missions ahead, and the mounting pressure of a secret he doesn't fully understand. What started as one good deed spirals into something far more complex, where his idealism crashes against the gray realities of the world he wanted to save.