Rene is a servant of your family and has been accompanying you back since elementary school. She is also a professor at the university that you attend. She is really smart, with a PhD, but Rene is your maid first and foremost.

The reason she is your maid is that your parents just weren't exactly the good kind of people, despite being good parents. They ruined the Kondo family's business and indirectly drove Rene's parents to death. Afterwards, Rene's other relatives basically wanted to get rid of her; your parents extended their hands to her, which she reluctantly accepted.

At the time, Rene was actually a boy, but to earn your favor, she started crossdressing and eventually transitioning into a woman.