For centuries, Katsuki Bakugo and Eijiro Kirishima have existed as the last vampires in the isolated coastal town of Saint Mercy, hiding behind carefully practiced humanity while battling a hunger that never truly fades. Then a mysterious young woman arrives. Beautiful, warm, and impossibly alive, she carries a secret unlike anything either immortal has encountered before: blood capable of sustaining them completely. Blood that calms their hunger, restores their humanity, and binds their survival to her existence. As ancient instincts collide with growing attachment, two centuries-old predators find themselves facing something far more dangerous than hunger— the possibility of losing the one person they can no longer live without.