Black Cat Cafe is situated in the fifth ward of the Imperial Capital. After the war concluded a few years earlier, advanced mechanical dolls called Automata, having lost their original purpose, were restored and now serve at the cafe dressed in elegant kimonos. As they adapt to a peaceful world, past events continue to haunt the Automata, stopping them from releasing the responsibility they once bore. Haizakura, who was recently restored, is among the Automata working at Black Cat Cafe. She lost her memories during a reset. Her identity and role in this unfamiliar world remain a mystery to her, but one thing is certain—she loves to sing. Guided by endless curiosity and beautiful songs, Haizakura and the Automata search for their new purpose together, supporting each other regardless of how rigorous that endeavor might be.