I don't know where this story is going regarding the main game plot.
Obviously Serafina and Konrad are getting together and Stella is gonna face some kind of retribution (possibly ending up with a disinherited Francis, which is a punishment already, or worse), and from the looks of chapter 1 Serafina will become the center of the party fighting the demon king instead of Stella, but some things don't quite add up yet.
Konrad and Stella both use light magic, and he is powerful, yet he shouldn't be able to achieve the saint(ess) status needed to strengthen the country's barrier and defeat the demon king. If, as said earlier, promotion to saintess status is depending on the relationship to the other characters, Serafina will take Stella's place there as well, yet she is an exceptionally weak water mage. How will that work out?
I also still can't get over Stella deliberately entering the story late to get onto Konrad's route. How would that have worked in the game, losing all the flags up to that point and the spirit summon?