E.T.E Chronicle (macOS)

In the near future, chaebols will replace the regime, and wars will continue to fight for interests.
Igodra discovered the remains of an alien codenamed [Urd] and its equipment in the near-Earth universe, and then discovered a mysterious particle that humans have never been able to understand, the delta particle.
The emergence of delta particles has broken the balance of power in mankind. Relying on its unique delta technology, Igodra has developed a powerful retractable tactical exoskeleton, Aita, whose military strength has achieved an absolute advantage over the chaebols.
In order to consolidate its own interests, Igodra built a huge circular orbital base over the equator, the Gray City, and carried strategic weapons on it.
The existence of the Gray City threatened the interests of other chaebols, who united to form the "Human Alliance" to jointly attack the Igodra Corporation. In the end, the Human Alliance won the war at a heavy cost, and the Ash was paralyzed, but the absolute strength of the Igodra group remained unshaken.
During the war, the Human Alliance captured the artificial life form 01 manufactured by the Igodra Group based on Ould, and then independently developed Delta Technology and Aita, breaking the monopoly of the Igodra Group on Delta technology, and the Human Alliance and the Igodra Group entered a period of confrontation.