Tokyo: I Loaded up the Dream Game

It has been more than 20 years since I was reborn in Tokyo. My parents are dead, I have no sister and no house. I thought I would spend the rest of my life just like this. But—— [Get ready to start the dream game...] Looking at the panel that suddenly appeared in front of him, Izumi Cang fell into deep thought. Dream game? What the hell? And why are all my classmates my students? There seems to be something wrong with this dream game...