Kei Sha was orphaned in a bandit raid that destroyed his village and killed his parents. A local weaponsmith took him in, and he lived and worked in an old weapons shop. He participated in mock tabletop strategy tournaments there, winning prize money. His talent drew attention after he defeated one of Ri Boku's students, leading Ri Boku to take him on as a student and protégé. He rose to become a key Zhao military commander, renowned for his instinctual tactical abilities. Ri Boku considered him the strongest candidate for the final seat of the Three Great Heavens. Kei Sha possessed exceptional leadership, inspiring fierce loyalty in soldiers like Gaku Ei with his calm demeanor and words of praise. Clean-shaven with long black hair tied into two spheres featuring a chessboard pattern, he typically wore orange and black robes over his armor. His tactical approach earned him the epithet "The Silent Hunter." He employed a defensive style likened to a spider weaving a web, observing battlefield flows to set traps before counterattacking. Ri Boku noted Kei Sha defeated him in numerous simulation battles and described him as one of the most terrifying instinctual generals. This ability allowed Kei Sha to nearly overwhelm Duke Hyou at the Battle of Kankoku Pass by attacking the Duke's army rear, though Duke Hyou remarked on his elusiveness. During the Coalition Invasion, Kei Sha commanded Zhao forces attacking Bayou and later engaged Duke Hyou again at Kankoku Pass, recognizing and evading a Qin pincer attempt. Years later, he commanded 40,000 Zhao troops at Koku You Hills alongside Ki Sui's Rigan reinforcements. On the first day, he isolated enemy units through flanking maneuvers and bait tactics, forcing retreats. However, impatience surfaced when Qin stalled, leading him to abandon his defensive web and personally attack the Hi Shin Unit. This culminated in Kan Ki trapping him, though he escaped with Ki Sui's aid. During the retreat, he deduced Kan Ki's critical weakness but was intercepted by Shin. In their duel, Kei Sha initially pressured Shin with precise swordsmanship but was ultimately slain. His final thoughts expressed regret at failing to repay Ri Boku and acknowledged Shin's unexpected growth beyond earlier assessments. His capabilities were quantified as strength (88), leadership (90), and intelligence (91), underscoring his balanced prowess as a frontline commander and strategist.