Hikaru Amatsuga is a middle school student who lives in Kita-Kagami City and one day, he hears cries for help and finds a mechanical lifeform in the...

The Mecha-Ude user Aki Murasame transfers into Hikaru's class with the intention to secure Alma. She belongs to an organization named ARMS and she...

Hikaru and Alma are taken to ARMS HQ. There, Hikaru is told that he is not suited to be a Mecha-Ude user, and Alma falls under ARMS' protection....

Hikaru was dealing with the fact that he had to still go to school while learning to live with Alma, working as a member of ARMS, and being followed...

Aki is finally able to track down the worm-type Mecha-Ude user who killed her family. But the person she finds is her younger twin sister Fubuki, who...

An incident where most of the Mecha-Ude users in Kita-Kagami City lost their minds and go berserk occurs. Hikaru tries to find out more about what...

After a fierce battle with Amaryllis, Alma regains his memories. His expression seemed grim, so Hikaru asks him what's wrong, but then Alma runs...

100 years ago, the founder of the Kagami Group, Yakumo, ends up losing his life after unsealing Ordela, the originator of all the Mecha-Udes. And in...

In order to seal away Ordela, who had awakened once more, Hikaru and Alma work alongside Kagami, who had acquired an even more powerful human-made...

The true masterminds behind everything that happened appear before Hikaru and Alma and they end up being ARMS' leader Aljis, and his Mecha-Ude, Fist....

Fist was plotting to take in Ordela's powers and take over this world to make it the new home for the Mecha-Udes. During the battle, Hikaru tries to...

Kagami successfully revives Hikaru, but he lets his guard down for a second and his body is taken over by Fist, who had obtained Ordela's powers....