All Mugen no Ryvius released episodes
A routine dive into the Geduld has turned into a struggle for survival as an act of sabotage sends the Liebe Delta Astronaut Training Center and everyone inside into certain destruction. Things continue to worsen as the station begins to collapse due to the effects of the Geduld. Someone becomes trapped near the collapsed area as Kouji and Ikumi hurry to rescue the person. However, there are dangerous levels of radiation separating them as Yuki, Kouji's younger brother, stops them and turn them back in an unfriendly manner.
As the condition of the Liebe Delta Station deteriorates even further, we start to see the intentions of the saboteurs. In an attempt to save everyone aboard the station, the Zwei evacuate everyone into the Rever and ready it to launch out of the Geduld. However, in order to prepare the launch in time, the remaining teachers purge what's left of the station to lower its velocity. In the meantime, Kouji and Ikumi are rushing to the Rever while carrying Faina who was injured duing the panic. They make it back in time as the teachers carry out the purge, sacrificing themselves in the process.
While preparing to escape the Geduld, the saboteurs try to take over the Rever so they will reach their rendezvous point. However, Aires and his gang foil their plan and the saboteurs are locked up. With the Rever finally ready to launch, the Zwei begin the countdown. In the end, nothing happens and instead of moving out of the Geduld, they are being pulled even deeper by the sabotuers' ship. Suddenly, the Rever regains power, with the help of Neya, and the Rever along with the central column of the station. As the station surfaces, we see that the central column is really a ship called the Ryvius.
The Ryvius is an advanced space cruiser of unknown design hidden deep inside the Liebe Delta station. It has a sophisticated computer control system, multiple support craft, a combat mech known as the Vital Guarder, a perfect 1G environment, and enough supplies to last the students for many months. Everyone aboard the Rever, except for the sabotuers, moves into the Ryvius and settle into the ship, expecting a long wait until they are rescued.
While learning how to operate and survive on the Ryvius, the crew aboard the saboteurs' ship prepare for their backup plan. The Zwei assign groups for certain jobs to make the operation of the Ryvius much smoother. However, Kouji and Yuki are placed into the same group and they are less than enthusiastic. Yuki's bitterness towards his brother, though, makes him take his anger on his brother, all while the Ryvius is being attacked. The Ryvius automatically defends itself by creating a well of immense gravity, destroying the ships in the process.
Everyone aboard the Ryvius tries to get along while they wait for help. However, they give that up as they realize that the captive saboteurs were with the Orbital Security Department and prepare the ship to move. Elsewhere, the news of Liebe Delta's destruction reaches the public as the OSD ship crew prepare for another fall back plan. The Ryvius' computer system is finally decoded and is ready to use. And just in time as the OSD are littering the Geduld with mines in an attempt to force the Ryvius out. By using the gravity field, the Ryvius manages the fend off the attack and dive even deeper into the Geduld. However, all of the remaining pieces of the central column fell off of the Ryvius, including the Rever which still has the saboteurs.