A mecha otaku is reincarnated into another world as Ernesti Echevalier, also known as Eru. In this world exists a huge humanoid weapons known as Silhouette Knights. Dreaming of piloting those robots, Eru, with childhood friends, Archid and Adeltrud Walter, aim to become Knight Runners, pilots of these Silhouette Knights.

A mecha otaku is reincarnated into another world as Ernesti Echevalier, also known as Eru. In this world exists a huge humanoid weapons known as Silhouette Knights. Dreaming of piloting those robots, Eru, with childhood friends, Archid and Adeltrud Walter, aim to become Knight Runners, pilots of these Silhouette Knights.