Kurogane no Linebarrels OVA

Gonzo has announced that a special OVA 'side story' (also called the 25th episode of the series) will be included on the 9th (and final) DVD release. The title of this episode will be "Tensai Bishōjo Kagakusha Rachel-chan" ("The Genius Bishōjo Scientist Rachel-chan"). As the name implies, the episode will focus on Rachel Calvin, the brilliant young head of JUDA's research and development from America. [source:ANN]

OVA special of the LineBarrels of Iron series.