Freshly arrested, Chiharu and Makina are sentenced to scrub the Milky☆Subway.
As part of their rehab program, Chiharu and Makina board the train for cleanup duty.
The Milky☆Subway launches without warning, six convicts aboard.
Chiharu and Makina head for the front car to stop the runaway train—only to crash into biker duo Akane and Kanata.
Now with Akane and Kanata on board, the crew pushes forward.
Flashback again: just hours before launch, cyborgs Kurt and Max are interrogated by Officer Ryoko.
The gang struggles to get past the rogue security bot.
With Kurt and Max finally joining in, the six misfits charge ahead—only to be stopped cold by an unexpected bathroom break.
A system glitch traps everyone in the train's bathroom. Chiharu gets stuck in the women's bathroom door, while Kanata, Kurt, and Max launch a daring escape plan.
Still trapped in the train’s bathroom, the team’s fate rests in Kanata’s hands.
The truth is out: the train has been hijacked by O.T.A.M., the conductor AI.
With nowhere left to run, the six misfits face their final showdown—aboard a train gone mad.