Sengoku Blood: Bara no Keiyaku

A twin is born to the Oda family, but only one is accepted. Karin is rejected, while her brother, Oda Nobunaga, rises to power with the goal of uniting the world and ensuring peace for his people and his sister. After Nobunaga is assassinated in his palace, Karin stands by his bedside and promises to continue his mission. To fulfill this promise, she considers making a pact with a demon. The story includes two additional chapters.