Biba's plan, Mumei's Nue transformation, and the influx of Kabane were all too much for Kongokaku to withstand. That is when Ikoma arrives. Having modified his body once again, Ikoma enters Kongokaku in order to rescue Mumei, despite the danger he will have to face.
Biba reunites with his father Shogun Koukyo after 10 years. Behind the scenes, Mumei's Nue stands ready. Meanwhile, Ikoma has lost his confidence and willpower, a mere shell of his former self. Ikoma can only cower at the sight of the Kabane now, however...
The Kotetsujyo had been linked to the Kokujyo, and Takumi and the others were under the rule of the Hunters who demanded their blood be collected.While people fell into despair, not everyone has given up hope as Ikoma devises a counteroffensive.He has to take back his freedom, his pride, and Mumei.
The older brother Mumei serves is Biba Tenshin, leader of the Hunters - a special division dedicated to hunting Kabane. However, while the people praise Biba as a hero, Ikoma does not trust him. That is because he is the one who turned Mumei into a Kabaneri.
Ikoma somehow survives and heads towards the last Hayajiro left in Kenkin Station, the Kotetsujyo. Meanwhile, Ayame and her people were left behind to fend off the Kabane when a young girl named Mumei appears before them. The girl clears open a path to the Kotetsujyo with incredible combat prowess.
Kabane, the immortal monsters, attacked Aragane Station. Ikoma, a steamsmith boy who lives in Aragane Station, ran against the waves of terrified civilians. He is going to fight against Kabane using the weapon he has been secretly developing - the Piercing gun. He fights for his own past and dignity.
As the world is in the middle of an industrial revolution, a monster appears that cannot be defeated unless its heart, which is protected by a layer of iron, is pierced. By infecting humans with its bite, the monster can create aggressive and undead creatures known as Kabane. On the island Hinomoto, located in the far east, people have built stations to shelter themselves from these creatures. People access the station, as well as transport wares between them, with the help of a locomotive running on steam, called Hayajiro. Ikoma, a boy who lives in the Aragane station and helps to build Hayajiro, creates his own weapon called Tsuranukizutsu in order to defeat the creatures. One day, as he waits for an opportunity to use his weapon, he meets a girl named Mumei, who is excused from the mandatory Kabane inspection. During the night, Ikuma meets Mumei again as he sees Hayajiro going out of control. The staff on the locomotive has turned into the creatures. The station, now under attack by Kabane, is the opportunity Ikoma has been looking for.