The right-side girl has red hair and a long braided ponytail, something no named/unnamed St. Gloriana character has as far as I'm aware. The left-side character isn't Vanilla because she doesn't have a ring that goes around her hair at around ear-level where her primary layer of hair ends, nor is she Rukuriri since she clearly has short hair plus her bangs don't really match.
Though perhaps they might be extra unnamed characters from episode 4 of Das Finale, though we won't know for sure until the BD is released next year.
The right-side girl has red hair and a long braided ponytail, something no named/unnamed St. Gloriana character has as far as I'm aware. The left-side character isn't Vanilla because she doesn't have a ring that goes around her hair at around ear-level where her primary layer of hair ends, nor is she Rukuriri since she clearly has short hair plus her bangs don't really match.
Though perhaps they might be extra unnamed characters from episode 4 of Das Finale, though we won't know for sure until the BD is released next year.
You are right. Too many difference to be them, unless the creator really don't know how to make them. They are probably invented characters