Azai Nagamasa ruled as daimyo of Ōmi Province, leading the Azai clan by inheritance. His politically vital marriage to Oda Nobunaga’s sister, Oichi, forged an alliance between their clans and produced three daughters: Chacha, Hatsu, and Go. Despite this familial bond, Nagamasa's deep-rooted loyalty to the Asakura clan of Echizen—longtime Azai allies—clashed with Nobunaga’s expansionist aims. When Nobunaga marched against the Asakura, Nagamasa chose honor over kinship, siding with the Asakura in a move Nobunaga viewed as betrayal. Their forces clashed at the Battle of Anegawa, where Oda and Tokugawa Ieyasu triumphed over the Azai-Asakura alliance. Retreating to Odani Castle, Nagamasa faced a relentless Oda siege. Foreseeing defeat, he secured Oichi and their daughters’ safe return to Nobunaga. With his family protected, Nagamasa remained in the castle. He died by seppuku during Odani’s fall, extinguishing the Azai clan’s power. His daughters survived, later gaining prominence, while his fate was sealed by irreconcilable loyalties to blood, legacy, and alliance.