The story takes place in Japan's tumultuous Sengoku era, where violent battles are being raged across the country. The "passionate and painful" story follows the "troubled fate" of the Sanada brothers, who have swo an oath that no matter what, they will fight to the bitter end together. Toyotomi Hideyoshi is on the verge of unifying the realm, and all that remains is the Odawara Castle protected by the "Lion of Sagami" Ujiyasu Houjou. Hideyoshi's personally trained generals — Ishida Mitsunari, Katou Kiyomasa, and Fukushima Masanori — as well as Otani Yoshitsugu, Shima Sakon, and Naoe Kanetsugu are all on the frontline of the battle. Amidst the battle formation are the two young warriors of the Sanada household: older brother Nobuyuki and younger brother Yukimura. As the stalemate begins to break down, Sanada Yukimura rides on a lone horse into the fray. His brother follows him right after.