Hello! I'm delighted that you enjoyed this game. It's nice to see you coming back after the main game. Thank you for sharing your thoughts!
Chain was a difficult character to write. He had little screen time, so I kept wondering how he is like in other settings. I'm glad you grew fond of him! Roya became more expressive, but you also saw more sides of him. The side characters will shine once more in the extra stories.
Hint for achievement 16: Roya chapter 1. After accepting to be his girlfriend, get the timed choice. You have missed one of the menu options after.