A man from the modern world is killed off through unknown circumstances only to find himself as a new born child in fantasy world that mirrors ones in fiction. Much the man's dismay, he is reincarnated as a female and as soon as he realises this, he takes an internal bow of infidelity. He also refuses to be married off to some duke's son a million miles away. Nor does he want to be thrown to some foreign prince to help relations.

What does he do? Train to become a sword master. But in this world, females are look down upon. How's that gonna work?!