[Machine Translation] In the 23rd year of Meiji, Shinjiro Minagawa a.k.a. Mina opened a western confectionery shop. The store is frequented by members of the "Wakasama-gumi," a group of former shogunate vassals, and Sara, a young lady attending a girl's school, seeking sweet confections and peace of mind. Shortly before that. In the Tokugawa era, Nagase, the son of a former shogunate vassal, who would have been called "Wakadono-sama," decided to become a police officer to make ends meet. He is currently undergoing training at a police training school in Shiba-Atago. In these days of unceasing rumors of pistol robberies, there is also an incident involving guns at the training school. The search for the culprit begins, involving the Wakasama clan, a group from Satsuma, a group of samurai who followed the Tokugawa shoguns to Shizuoka, the children of merchants, and various other students, as well as the suspicious-looking head of the school and its faculty members.