During a previous winter, the world had been overrun by nearly invincible vampires, which had reduced humanity to a secondary source of food, endangering their survival. Those individuals who remained had gathered in a secure city, taking shelter behind a massive wall, while fighting against their dominant adversaries. One fated day, Momo, a human fighter, finds himself in a face-to-face confrontation with Fiine, the queen of the vampire clan. Amidst the chaos of a vampire assault, Fiine attempts to rescue Momo's closest companion, leading the two to discover a mutual love for music and a mutual desire to escape the violence. Together, they embark on a perilous journey to a rumored paradise where both humans and vampires may exist in harmony. Both of them are suspicious of its existence and cautious of any potential dangers that lie along the way. Momo and Fiine must evade any confrontation with their own kind and those of the opposing races if they hope to emerge unharmed at their ultimate destination.