Aswangs, Engkanto, Maligno Etc. are Phillipine mythological creatures that are only thought as a legend and rumors for centuries. Most of them terrorize humans to live but some of them choose to blend in the human society.
Quezon City, the place where the highest number of Aswang related incident are in danger for its uncontrollable events. But there are people who can prevent them from terrorizing humans, they are called Bloodcasters. They use their own blood to create weapons that are lethal to Aswangs.
Allistaire, who just finished studying Bloodcasting techniques in her Junior High days, are recently hired for an undercover mission despite being labeled as a “failed” Bloodcaster. Joining a club with other Bloodcasters while being a normal Senior High student, Allistaire will give her best and prove to others that she can overcome her failures and become a strong Bloodcaster like her father.