Otto Von Heidegger Is Game-Brained

I thought I was winning when I was reborn in another world as the third son of a noble.
One morning, I looked at my face and realized.
I’m the villain in an adventure magic academy simulation RPG game…
Moreover, I’m the mean Duke’s third son, a fat man who messes with the protagonist in the first chapter of the school adventure part…orz
This is bad, at this rate, I’ll become the victim of a happy ending.
Don’t panic!! The game hasn’t started yet.
I have to avoid the fat flag!!