Synopsis: Sister Blood

From childhood, Saya admired her brother, Shou, for his kind and protective nature. They were inseparable and he was always there for her. Despite not having parents, they were content in each other's company. However, their happy life was disrupted when Saya was bitten by a pure-blooded vampire, turning her into one as well. Saya is now confined to their home as she fears losing control and feeding on humans. Shou locks her away to protect her from vampire hunters, including himself. Saya finds solace in her brother's care, but he cannot bear to see her suffer. He sets out to hunt the vampire who turned her in the hope of reversing the curse. Shou becomes proficient in vampire hunting, fueled by his love for his sister. Yet, aside from a desire to cure Saya, Shou is also motivated to escape the house. As a vampire, Saya's behavior becomes increasingly obsessive and aggressive towards him. He struggles to resist her advances. Will Shou succumb to his sister's advances, or will he kill the vampire first? And even if he succeeds, will it be enough to prevent the forbidden romance between the siblings?