Infinite Mana In The Apocalypse - Chapter -1 - Ranks/Levels/Realms(Spoilers as of 317)

I don’t know when, there is an extra mysterious area in the world that connects all the different planes, illusion. Here you can get countless wealth, beautiful beauties with different styles, and powerful powers that can destroy the world.

Countless people who seek their dreams and ambitions come here. Some laugh, some cry, some live, some die. This is the paradise of the strong. Here is the hell of the weak. And our story starts from the moment when a young man who has the most mysterious EX bloodlines in the whole fantasy world is born again seven years ago.

- Description from PhoenixPhantom

A mecha otaku is reincarnated into another world as Ernesti Echevalier (Eru). In this world there exist huge humanoid weapons known as Silhouette Knight. Dreaming of piloting those robots, Eru, with childhood friends, Archid Walter and Adeltrud Walter: together they will aim to become a Knight Runner, pilot of Silhoutte Knight.