Here is an overview of the game, via the official English website for the PC version:
Humanoid modules that control all aspects of the railway cars called “Raillords” exist in this world. The top of the former Imperial Railway 8620-type locomotive’s exclusive Railroad, Hachiroku, was among the many Raillords put out of commission with the impending era of rail closures. Sotetsu—a boy adopted by the Migita family in the town of Ohitoyo of Kumamoto prefecture—was a victim of an accident caused by this very era. Upon his high school graduation, he entered the Imperial University but has returned to his adoptive hometown of Ohitoyo to save it from water pollution caused by the building and proliferation of factories. He awakens Hachiroku by chance, becoming her owner, and the two, each with their own motives at heart, set out in search of the missing 8620 locomotive. Sotetsu, his adoptive sister Hibiki, and the Ohitoyo mayor and Ohitoyo Railway president Paulette, all join in to revive and make the 8620 operational again.
Maitetsu: Pure Station is due out for PlayStation 4 on July 26 in Japan.
Watch the TV spot below.