Highschool boy reincarnated as duchess in fantasy world.

Follow the breathtaking story of a high school boy. Reincarnated as a woman by a God into an unknown world. Discovering the reason for his reincarnation. The mysterious past of the body owner he possessed. The world filled with elemental powers and the land split between humans and demons. Reincarnated as a pawn of gods and thrown into a battle even gods can't interfere. He who wished to change the written fate, defying the rule set in stone. Which started out as an ordinary reincarnation soon turned out to be a world changing history. Prologue "Finally, my exams are over. I am going to play my left-over games in my summer vacation" While I was waiting in signal to cross the road. There was a boy standing near me nervously. "The time is running. I have to hurry" (unknown boy) Suddenly he started running while seeing his phone before the signal change. "Hey hey, wait" Before I could do anything, he was hit by a truck and died instantly. His phone flew up and fell near me. Soon Police and ambulance arrived there. I picked up his phone. There was some location marked in the phone. Is he trying to meet up with someone? I have to at least tell them the information. I went to the location marked on the phone. "Nobody is here, this is just a lake view" "You arrived right on time. Come closer" (Mysterious voice) "Is there a voice coming from the lake?" I just went near it to peak. Suddenly it turned blue, and the water grabbed me. "Wait, Wh...., help" After a brief moment, he wakes up in an extravagant bed surrounded by unfamiliar things. A maid ran towards him with shocked expression. "My lady, thank goodness you are alive. We thought you would never wake up" (My lady? who is she calling lady? did I admitted in some rich hospital. I have to go away from here) When I tried to walk away, I saw a huge mirror at the height of me, I was shocked to see a woman. (No, no, no. what is this, Is this some kind of wet dream) Suddenly, a kid with tears on his eyes ran towards me and hugged my knees. "Mom, no matter how much you hate me, you can't leave me. Please don't go away.) Who is this child, what is this place. Is this a dream? Or I am reincarnated? Why? Why I am a girl? Who is this boy? Is he child of this body owner? Did I mistakenly summoned here instead of the boy who died in accident? What am I supposed to do?