I Transmigrated As The Dark Archduke But... I Am A Girl?!

Lord Lucien Maximilian Nightshade. Archduke of Vanehiem Duchy and an ice knight-mage, vassal to Helios Empire. The most cutthroat, the most cunning and the most powerful man of the region. But actually, he is the the SSS tier final boss in a strategy open-world RPG game called the War of Victors. You see, I might be the school-thug, a gamer and dream of a cute girlfriend to spoil like in those dramas... But I am girl dammit! GL masc main character, but still a high-school girl! What do you mean I am now Lucien Nightshade?!! And what do you mean I am now the most eligible bachelor in the Empire?! Why are spies and assassins after me, I didn't even do anything?! I have to go to war now?!! AHHHHHHH-- *cough* ..ahem, I mean if there are cute girls involved, I may just be tempted to continue pretending like the cold, genius, tall, dark and handsome Duke. *cough*