I'm just here to check the game... And then I saw this above my comment a year ago. Halloween Otome was meant to be just that, a romance between Emma and Lan/Erik/Ty. But then the creators had their ideas and expanded the world. (Edit: I was wrong. They always meant to expand the world, but they didn't expect many attention with Halloween, thus they kept it down and went all out with Valentine's. But my point still stands.) It was how Valentine's and Christmas came to be. That's how I understood it if I'm not mistaken. I read about it somewhere.
You can say that this series is not an otome tho, might be a romance visual novel instead. You get to play the games for free anyway, so please be considerate with your words next time. Let the creators do what they are happy to do.