Thank you so much for playing! We're glad you love the demo so far :D If you've got fanworks, please show us whenever!
The name "Rosenkreuz" drops quite a few times since RA's MC is also one of the High Council's members and their father is the Senior Alchemist of the organisation.
You can fully play this game without knowing who Nerifiel and Beringer are. But as a quick explanation, Neri is RA MC's childhood friend and Beringer is a side character in RA that got rescued and taken in my RA's MC.