The kingdom of Midland is plagued by demons, creating a chaotic environment. Guts, a skilled swordsman, struggles to find stability due to his demonic brand, which makes it difficult for him to stay in one place. He's burdened with the added responsibility of protecting Casca, the former Commander, who has lost her memories and trust in Guts. Their journey to find a safe haven for Casca, such as Elfhelm, is fraught with danger as they navigate through the demon-infested lands.