The Traitor and Assassin of Reality

Hayase Erzol, find out that he is to become an Assassin, he is taken under the wing of the Zaish Traitor, Barbatus, as Hayase hones his skills, he has to go through some ups and some downs and he is on a mission to find his main purpose that he sees as fitting and accepting to himself.
He also explores the nation through the Vikings, Victorians, and many more.
There is no end to what this man shall do.