Silent Witch - Chapter 5Book 14: : A Secret Friend

What the heck? She, a famous doctor from the 23rd century, turned into a village peasant girl of a different world!

Her grandmother was cruel and vicious. Her aunt was very mean. So, to have a meal and clothing every day, she, a famous doctor had to pull up her sleeves to do farm work, treat patients, and abuse the bullies!

What? Grandmother need money for her illness? Cousin has no money to get a wife? Cousin needs to borrow money for his studies?

Roll! Roll as far as the history can go!

- Description from Novelupdates

After Stargaze Family executed his family, Noel Ardagan embarked on his journey, restoring his family name with the help of a System.

"What? How the heck did she get it before me? The system told me that I'm the only one who knows about it!" Noel Ardagan cursed in anger, "That conniving murdering woman!"

"At this point in time, only I should be aware about this tomb. But how did he find out about it?" Anna Stargaze, even after her reincarnation, couldn’t comprehend Noel's actions.

The clash between of a person holding a system and a reincarnator who knows everything in the future is about to start.

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.