According to legend, Y, a famous clockmaker, constructed a new world from gears and cogs after the Earth's destruction. Despite his keen ability to recognize the workings of clocks by sound, Naoto Miura has not made significant progress in his pursuit to become a skilled clockmaker. However, his life undergoes a drastic change when a coffin crashes into his apartment, revealing RyuZU, a female automaton crafted by Y. RyuZU's arrival attracts Marie Bell Breguet and her cyborg bodyguard Vainney Halter into Naoto's life. Marie, a highly skilled clockmaker from a prestigious lineage, becomes captivated by RyuZU and decides to investigate the circumstances surrounding her appearance. They soon unveil a shocking revelation: the clockwork planet that has served as humanity's home for centuries is rapidly deteriorating, a fact that many seek to conceal. As they become entangled in a perilous conflict, Naoto and his newfound allies must race against time to save their world from impending destruction.