Second season of Hell Mode: Yarikomizuki no Gamer wa Hai Settei no Isekai de Musou suru.

Once upon a time, an unidentified enemy, the Unknown, suddenly appeared. The Super Evolutionary Railway Development Agency, had developed the Shinkalion, a robot that transforms into a bullet train, as a countermeasure against this threat. (Source: Official Website, translated)

A.D. 2087 - the United Lunar Empire Giganos wages war on the Earth Federation Military to take control of the planet and establish a rebirth of the human race. During an invasion of a colony by Giganos' forces, three civilian men stumble upon a trio of top-secret Metal Armor units called Dragonars and pilot them to combat the enemy forces.

Universal Century 0096. Several months have passed since the incident surrounding Laplace's box also known as the Universal Century Charter. The Earth Federation Forces dispatches a group of investigators to the severed Axis which is drifting outside the Earth Sphere. Two civilians participate as members of the research group: Arlette Almage and Danton Hyleg. Both have pasts with government service to the Principality of Zeon and Neo Zeon as an engineer and test pilot. Having infiltrated Axis, the investigators come under attack inside a base where no one should be. Arlette and Dalton are confronted with an incident they never imagined. (Source: Zeonic Scanlations)