[DeepL Translation - needs review] Introduction to Volume 1: The famous detective Seishiro Yumemizu arrives in "Retro City," a recreation of a town that existed 50 years ago! There, the mysterious Kaijin Gen'eishi, who is searching for hidden treasures, is making a commotion in the city. Together with his sisters, Io Miyasato and Mio, elementary school students who love to solve mysteries, Seishiro Yumemizu confronts one mysterious case after another! What will happen in the showdown of the ...
