"Broken Blade," also known as "Break Blade," is a 12-episode anime series adapted from the manga by Yunosuke Yoshinaga. Set in a fictional world where nations are in constant conflict, the story revolves around the use of ancient quartz technology to power mechs called Golems, which are central to warfare. The narrative focuses on Rygart Arrow, a rare individual unable to manipulate quartz, making him an "un-sorcerer" in a society where most people can harness this energy.

Rygart is called back to his homeland of Krisna by his childhood friends, King Hodr and Queen Sigyn, after a long absence. Krisna is on the brink of war with the neighboring nation of Athens, which possesses advanced Golems and superior quartz technology. Rygart discovers an ancient, damaged Golem named Delphine, which he can pilot due to its unique mechanical controls, unlike the quartz-dependent systems used by others. This ability makes him a key asset in the conflict.

As the war escalates, Rygart is thrust into the frontlines, grappling with his reluctance to fight and his desire to protect his friends and homeland. The series explores themes of loyalty, sacrifice, and the moral complexities of war. Key characters include Zess, a skilled Athenian Golem pilot and Rygart's former friend, who becomes his adversary on the battlefield. Sigyn, the queen of Krisna, struggles to balance her duties as a ruler with her personal feelings for Rygart, while Hodr faces the challenges of leadership in a time of crisis.

The plot is driven by intense mech battles, political intrigue, and the personal struggles of the characters as they navigate the chaos of war. Rygart's journey from an outsider to a pivotal figure in the conflict forms the emotional core of the story. The series balances action with character development, providing a detailed exploration of its world and the relationships that define it.