To celebrate the hard work of women on the railroad, Tommy Tech has decided to create a series of mascots that feature women in various roles on it. After their great success, it was decided to make gadgets first, then books, anime, CD Drama and finally a TV series. The drama focuses on the work of women on the railroad. It's heroines are the personifications of the most popular and best-selling mascot models from Tommy Tech, thru years. Each episode focuses on a different character.—MyDramaList