I'm pleased to hear that you had a good experience. Thank you for the praises!
Actually, Chain's story has been on my mind but I haven't had the chance to go for it. For now, I wait until I have more time on my hands and if there is enough interest.
If you play through all routes, you'll see what's in store for Roya's fate. So far he only interacts in 2 routes and appears briefly in another. The comment above yours had a question regarding him as well. I explained a bit more about him in the reply. Be warned that there are spoilers. I recomment to read after you've completed the game or have played enough.