The Tetsushojo (哲少女, Tetsu no Shojo Literally Meaning “The Iron Maidens”) are different models of experimental ships that have been developed by and used by Senju Corporations. However the world government seems to have made a contract with Senju Corp. to create some for their military force and will gladly give them to a customer who has the money for one. They get their name the Iron Maidens from their structure created all from metal and piece of adams wood embedded in the metal working.