In the heart of 18th-century Edo, a former samurai named Kenjiro has traded the bloody way of the sword for the meticulous craft of clockmaking. His quiet life with his young apprentice is shattered when a dying man leaves them a complex, ruined Dutch clock. The mechanical marvel hides a cipher leading to a cache of smuggled weapons—a prize a corrupt lord will burn the city to obtain. To protect his apprentice and prevent a rebellion, Kenjiro must unlock the clock’s secrets and wield the blade he swore to forget.