Hello!!
Thanks for your comment. We're so glad you're enjoying the game. There's an official guide included with the artbook, but if you're referring to the routes, I can give you a brief outline of Chronicles.
The key points are after Chapter 5, where you choose your alignment (Angels, Humans, and Demons), and Chapter 10, where, within those alignments, you have the option to choose who to continue the romance with. Those are the two key points. I hope this has been helpful.