Beginner's Test for Infinite Power

Synopsis

Simon, the prince of the Finsphener kingdom, loses his relatives due to the schemes of a trusted aide. He was lucky enough to escape with his sister and was taken in by a knight as an adopted son. However, on one fateful day, Simon's new family was massacred, and his sister disappears. Simon begins the journey of revenge and searches for traces of his missing sister. Can he succeed in revenge against Cavity, the once-trusted aide, and regain his title as the rightful heir of the throne? (Source: MangaDex)