Vampire Hunters K.O and T.K.O

In the wasteland where monsters roam freely, teenage twin brothers Kaio and Terbio hunt vampires and various creatures to survive their journey through the land after a fight they had years ago, and now they start new journeys as they take jobs from different clients and fight various battles for survival, while they are being searched for by their former friends and family and being tracked down by a female vampire who formed an interest in both of them and a rat who formed a love interest for Kaio. (Warning: this story contains dark elements, blood, gore, cursing, blood sucking, and brief sexuality with any female's breast and behind being touched, nightclubs, sexual clothing, and females being seen without clothing but not too explicit, read at your own risk)