No purpose! No ideology! No claims! An unprecedented space train spectacle anime is now a manga! Chiharu, an enhanced human, and Machina, a cyborg, are arrested for violating the Intergalactic Traffic Act. At the same time, other unusual pairs—enhanced humans Akane and Kanata, cyborgs Kurt and Max—are also caught. Police officer Ryoko assigns them all a “community service” task: cleaning the interplanetary express train known as the Milky☆Subway. What seems like a simple assignment soon spirals into a full-blown intergalactic disaster!