If I recall correctly, the WN had the sisters in the opposite positions, with the gyru older sister being the one trying to sacrifice herself - she acted as a sloppy gyru so she was worth less to the family, and was a better sacrifice option.
Likewise, the younger sister acted hateful and bratty to her older sister, because she knew the sister was getting sacrificed and couldn't bear to get closer to her when she was going to lose her.
But adaptions always change things around, but these changes seem kinda needless, and a little worse than the original version.
It'd just make sense that the older sister was willing to be sacrificed for the younger, and that being a gyru (in such a 'proper' family) would be a means of ensuring so. If she isn't the chosen sacrifice, her fashion choices seem a little out of place when looking at her family.
