Real name: Chiharu Kujo. Taken into custody along with Makina for speeding, obstruction of justice, and bombing a police vehicle. Despite her age, she behaves childishly and is very friendly. Augmented Human. Female.

Real name: Makina Kurusu. Taken into custody for the same crimes as Chiharu. Belligerent and tomboyish. She stays loyal to those she trusts. She is a young lady from Titan Industries, but she doesn't think very highly of that fact. Cyborg. Female.

Real name: Kurt Kramer. Taken into custody along with Max for illegal possession of sugar. Languid and generally indifferent to others, he loves gaming. A former Army man, he excels at manual labor and precision tasks. Because he was treated like a machine and never thanked in his previous job, he gets flustered when thanked, though he is secretly very happy. Cyborg. Male.

Real name: Max McAllister. Taken into custody for the same crime as Kurt. Cheerful and generally indifferent to others, he loves gaming. A former Army man, he is primarily in charge of gadget operation and hacking. Because he was treated like a machine and never thanked in his previous job, he gets flustered when thanked, though he is secretly very happy. Cyborg. Male.

Real name: Akane Daidoji. Taken into custody along with Kanata for speeding. Large-framed and blunt, but has very strong feelings for her comrades. She is physically very powerful. Augmented Human. Female.

Real name: Tetsuta Iwao. Taken into custody for the same crime as Akane. He calls Akane "Boss." He only uses polite speech when talking to Akane. Despite being small and quick to pick fights, he is actually weak. However, he is intelligent and can immediately understand complex verbal explanations. Augmented Human. Male.

A police officer who explains things to and interrogates the seven. A former delinquent. Human. Female.

A conductor robot made by Titan. She is old and degraded, making it impossible to operate the train safely. In the past, she has trapped criminals who boarded for the rehabilitation program, forced the train to run, and caused them to kill each other. She is programmed to ensure only Makina and Guest return safely. The mastermind. Uses polite speech. An onboard robot. She is broken and cannot converse well.