|Created by||Akira Jotaro (aka Justice0)|
|No. of episodes||18|
|Run time||23-25 minutes|
The story is set on Earth in year 2513 AD, 50 years after the starting of the First Ultradite War, a war for a new and very valuable material named "Ultradite," which had split the countries into three nations. The story is about a mercenary who has no loyalty on any side of the war and will only do as he is paid to do, until he comes upon a machine built by the neutral nation, the BPA (Blue Planet Alliance).
For seven years now, Shiro Akatsuki has lived his life as a mercenary under the alias, Jack Grimm. Since he was a child, he has never supported any of the three nations, the UNW (United New World), the NAE (Neo Asian Empire), or the BPA (Blue Planet Alliance), because he had hated the war and had also hated that the BPA would do nothing to try to stop it. Since the war had started in year 2463, the countries who had owned property of the new energy material, Ultradite, a diamond like stone that can generate energy strong enough to power an entire city for a year with just one stone, had disagreed with each other and wanted the material for themselves, so they had split into three new nations three years after the war began. The UNW controlled the Americas, Greenland, the western half of Europe, and Northern Africa; the NAE controlled all of Western and Central Asia, Russia, and Eastern and Central Africa; the BPA controlled Japan, Western and Southern Africa, England, and a giant terraformed island named Blue Isle.
Now the year is 2513, the war still continues and Shiro continues his mercenary work, being available for anyone who hires him and his group, the Cross Group. After being hired by the UNW to fight in a battle against the NAE in the Pacific Ocean as a secret soldier, Shiro finds a town in an island and tries to tell the armies to stop or else they'll be hit but is instead injured by a stray bullet from the war and loses his left eye. In the middle of the battle, a fight between two mechas had occured and the NAE mecha had dodged the gunfire and almost destroyed the town if it wasn't for a new mecha coming out of the sky and defending the town. Because the mecha had defended the town from gunfire, it was shot down; injured, Shiro went to see the mecha and had found a BPA Pilot that was almost dead from the cockpit being shot open. The BPA Pilot had then given Shiro the key to operate the mecha and told him to stop the war, so Shiro took the key and helped him out even though he was very injured. As Shiro enters the mecha, it shows on the screen its name, Central Rail On-Star Striker, C.R.O.S.S. and uses it out of his anger and uses it to fight against both the armies. As the story continues, Shiro starts to support the BPA and disbands his mercenary group even though they still follow him, and he later meets a young prodigy named Ellise Illumina who is the inventor of the C.R.O.S.S. and also the girl who fell for him.
- More known by his clients as Jack Grimm. He is a mercenary who hates the war but can only making a living by being part of it. He is a 18 year-old man who cares for the people and is willing to take a life to protect another. He often often reffered to as a rude slacker who doesn't do anything by people who don't know him very well or haven't seen him in combat. He is a combat specialist who has trained for 8 years in military martial arts and weaponry by his grandfather who was a BPA Rear Admiral. He has a major fear of dogs and will tend to back far away whenever he hears a bark or sees a dog. He is the leader of the Cross Group mercenaries and even after disbanding the group, they were still willing to follow him to the end. Even after choosing to join the BPA army, he still does things his own way and only wears the uniform jacket, because of this, he has never been promoted above Ensign even though his charisma and pilot skills are both in Captain rank. He is voiced by Kenichi Suzumura.
- The 17 year-old mechanics prodigy who had designed the mecha, C.R.O.S.S., for the BPA. She is a very intelligent but clumsy girl who is also the chief of the BPA Mech Department HQ. She had fallen in love with Shiro on first sight but had tried to deny it since he was very rude to her and had done almost none of the work she told him to do. Because of her clumsy behavior, she is often looked down upon by her superiors but always amazes them after telling them about the Mech Department plans for building. She is voiced by Maaya Sakamoto.
- The Chairman of the UNW and a handsome middle-aged who began to wear a mask after a failed assassination attempt on him. He is a very charismatic man who believes that power can unite the world, and to obtain the Ultradite would be the key to obtaining power. He had invented a giant mecha that he named the King's Throne, which he uses against Shiro in the final battle of the war. He is voiced by Takehito Koyasu.