Gainer Sanga, a skilled video game player, leads a normal life in the domed city of Yapan until he gets involved in a mysterious altercation, leading to the activation of an Overman.
Gainer, accompanied by his friend Gain Bijou, escapes from Yapan on the Overman. They encounter resistance from the city's authorities and are forced to flee into the wilderness.
Gainer and Gain encounter a group of rebels led by Sara Kodama, who offers them shelter. Gainer learns more about the conflict between the Exodus and Siberian Railway factions.
Gainer and his companions join forces with the rebels to launch an attack on a Siberian Railway outpost. Meanwhile, Gain confronts his past as a member of the Siberian Railway.
Gainer and the rebels face off against the Siberian Railway's forces in a fierce battle. Gainer struggles to come to terms with his newfound role as a pilot and the responsibilities it entails.
Gainer and the rebels continue their journey across the frozen wasteland, facing numerous challenges along the way. They encounter a mysterious girl named Meeya La Londo, who possesses strange powers.
Gainer and the rebels arrive at a remote settlement known as Gachiko, where they encounter resistance from the local inhabitants. They must find a way to gain their trust and secure supplies for their journey.
Gainer and his companions liberate Gachiko from the oppressive rule of the Siberian Railway. However, their victory is short-lived as they face retaliation from the Siberian Railway's forces.
Gainer and the rebels launch an audacious assault on a Siberian Railway stronghold, hoping to gain access to vital resources. However, they soon find themselves outmatched by the enemy's superior firepower.
Gainer and the rebels make a daring escape from the Siberian Railway's clutches, using their Overmen to evade capture. They continue their journey across the frozen wasteland, determined to reach their destination.
Gainer and his companions arrive at a crossroads in their journey, where they must make a crucial decision about their next course of action. Meanwhile, tensions flare within the group as conflicting agendas come to light.
Gainer and the rebels are forced to take a detour through treacherous terrain, facing obstacles and dangers at every turn. Along the way, they encounter a group of nomads who offer them assistance.
Gainer and the rebels find themselves embroiled in a fierce battle with the Siberian Railway's forces, testing their skills and resolve to the limit. As casualties mount, Gainer must find a way to turn the tide of the conflict.
