Missing detective, severed arms, and danger: The Taisho-era investigation begins!

It was the Taisho era. Mikagura Tokito was the director of a detective agency, which had solved a lot of cases. One day he disappeared, apparently involved in an accident. Tomoe, Shigeno, and Chizuru, who adored him, got anxious thinking about what had happened to him. Hearing that Shigeno's elder brother had seen him at a church in a foreign country, they travelled there hoping to meet him again. However, it was a dead body of a priest in a church which they found there. Furthermore, they found his arms had been cut off from his body. Because they thought his death had something to do with Tokito's disappearance, they investigated the case. Suddenly they were attacked by men. Being involved in danger, they tried to find Tokito but will they find him?