Not Lives

Not Lives summary:

Mikami is only in high school but he is a game designer genius. He has created many popular games ranging from RPG to action to even puzzle games. From a classmate’s request, he decides his next project will be a romance game so he begins to gather research material that will help him make another hit game. But when Mikami gets home, he finds a game called Not Alive that he doesn’t remember getting and curiously, he plays the game and the next thing he knows, the CD goes inside him and he has turned into a girl!