Before the second semester's final exams, Momo-kun's friends once again come to his house to study. In order to avoid extra classes and retaking the exams over Christmas, Momo-kun does his best to study, but he tragically ends up failing. Meanwhile, Ku...

The Galaxy Express 999 has crash landed on a strange planet. Sirius platoon arrive to discover the reason for the crash: The shield protecting the planet has been stretched ... by mysterious hands.

Due to a mysterious drifting space seed, the Alta Line Express 637 is now stuck, and it is once again Sirius to the rescue. But while trying to reach the ship, a beam emerges. Is this the end of the crisis, or the beginning?

The SDF Sirius Platoon engages on a mission to rescue hostages. Afterwards they begin receiving distress calls from trains near route 309. The SDF Platoon is sent to investigate the cause of these events on an unusual planet.

During the pursuit, the 641 ignores a call from enemies in the main battleship, putting everyone on edge. Big One appears to rescue the 641 in time, only to learn that a civil war may be brewing below on planet Guerra.

Haruhiro and his party are enjoying their first earnings. They are getting used to life here, but continue to work hard to live.

The series heads to a conclusion as Kogami and Makishima are locked in mortal combat, while Akane tries to stop Kogami from killing Makishima in order to save Kogami’s life and uphold the law.

Haruhiro and his party are in the Cyrene Mine. Ranta got separated from the party and is fending off kobolds alone. Can they all get out alive?

Following Makishima and Kogami, the CID Division 1 detectives arrive at the facility where the Uka-no-Mitama virus is managed. Now it’s a race between Kogami and the CID to see who can get to Makishima first and stop him from releasing the modified virus.

When the CID is brought in to investigate a disappearance of Kimihiko Hayama, they discover that not only has he been killed, but someone has taken over his net avatar, Talisman. The CID tries to track down the fake Talisman in order to find the killer.

The Dominator reveals the whole truth of the Sybil System to Akane. Knowing the truth, Akane must now decide how to proceed. Meanwhile, Kogami continues to pursue Makishima, who is making steady progress on his plan to bring down the Sybil System.

Haruhiro and his party now know Mary's past and try to have better teamwork within the party.

After escaping, Kogami visits Saiga to ask for help determining what Makishima’s next move will be. Although Division 1 is assigned to capture Makishima alive and execute Kogami, Ginoza still hopes he can get Kogami to surrender before he kills Makishima.

After reading Kogami’s personnel file, Akane attempts to learn more about Kogami’s past and why he ended up as an Enforcer. Meanwhile, the CID detectives attempt to figure out who was helping Kanehara commit murders in the Hachioji Drone incident.

After Makishima’s escape, the MWPSB’s Chief assigns Division 1 to recapture him alive and orders Kogami taken off the case. However, Ginoza feels that Kogami is best able to track down Makishima, so he hatches a plan to keep Kogami on the case.

While Kogami is recuperating from Akane’s Paralyzer shot, she begins to worry about whether she is suited to be an Inspector after the fallout from her first case. On her second day on the job, she begins to learn more about the Enforcers she works with.