In the beginning of Chapter 10, Leanne is unaware of the Crank Seminary incident's anniversary and didn't know that it was the day Vashyron and Zephyr met. But considering she's lived with them for over a year (counting from Christmas), shouldn't she have experienced this once before already?
Adding to that, a lot of dialogue (in Ch 13 and 14) makes it sound like it really has been only a year since she joined the hunters. So when the game's opening scene says "A year and a few months later" does it count from Vashyron and Zephyr's first meeting or Zephyr and Leanne's? The game probably makes more sense with the former.