Journey into an Unknown World

This book is slow-paced and develops from scratch, but what is really interesting is the process of development. [Fantasy + time travel + different world + fictional history + medieval western + war + multiple female protagonists. ] He accidentally came to a world full of unknowns, unknown culture, unknown words, unknown everything, and the dangers of human nature. This is a magical journey. Can he survive here, and will there be a good ending? The prologue is the beginning, and then his story/the story of this world begins...