A crucial battle between the Principality of Zeon fleets and the Earth Federation Forces fleets is about to unfold. At the back of the battlefield, the 603 Technical Evaluation Unit on the evaluation support ship Jotunheim awaits the opportunity to utilize the serpent-like prototype anti-ship cannon called Jormungand in battle. The gunner of the Jotunheim believes that the Jormungand is the key factor of this fleet battle and is eager to fire... However, before the Jormungand has a chance to make an impact in the battle, the red Zaku of Lieutenant Char Aznable brings a cold hard truth...