For the 73rd class of cadets of the Defense University of the small planet Kibi, a shakedown cruise on the fleet's new starship Amaterasu is a fitting lead-up to graduation. As they are returning to their home planet, however, they are shocked to hear news of a declaration of war by the aggressive Kingdom against Kibi. When their planetary government surrenders without a struggle, the cadets decide to launch their own war, aboard the Amaterasu. To gain funding, they make a deal with a galactic news network - and find themselves the stars of their own reality show. Unfortunately, this is the kind of reality show that can get you killed... (Source: ANN)

In 2061 CE, humanity's indiscriminate pollution of space has substantially hindered the development of space travel. In response, an international federation has designated the sun as a natural incinerator, federally establishing a treaty with the goal of first processing hazardous waste on Jupiter and forming the space environment defense force Cosmo Ecology. However, polluters evading surveillance networks continue to illegally dispose of radioactive waste directly into the sun. As a result, increased solar flare activity is on the verge of turning the Earth into a desert. (Source: ANN)

A distant Federation outpost Fort Casey comes under attack by bugs. The team on the fast attack ship Alesia is assigned to help the Starship John A. Warden stationed in Fort Casey evacuate along with the survivors and bring military intelligence safely back to Earth. Carl Jenkins, now head of the Ministry of Paranormal Warfare, takes the starship on a clandestine mission before its rendezvous with the Alesia and goes missing in the nebula. Now, the battle-hardened troopers are charged with a rescue mission that may lead to a much more sinister consequence than they ever could have imagined... (Source: Amazon)

After the events of Invasion, Johnny Rico has been demoted to the rank of colonel and relocated to a Martian satellite to train a new batch of troopers. Unfortunately, these troopers are some of the worst low-performing Rico has ever trained as they're Martians and don't take the war seriously. Mars overall has low support for the war as they see their planet unaffected by the bug conflict and even suggested pulling out from the war. Because of their laid back attitude, the denizens of Mars wasn't ready when the bugs attacked. Unknown to everyone, Sky Marshall Amy Snapp executes her plans for power. (Source: Wikipedia)