I have been reincarnated... as a love-rival's friend

In a world where previously known as the world in an otome game, I was born. At first, I don't know that this is a world in a certain otome game since I just remember exactly where I am, at 15 years old, standing on the stage of the opening of the game. Thankfully, I am irrelevant to the game's story-line, so there's...