Oh no, this isn't gonna end well. Damn, the sister got such great chemistry with Sora.
Yes, which makes the author a b****.... a**hole literally gave way too good chemistry to a random side character...
It's not like the other 2 girls were bad by all means... hell, I'm sure that the reason the author gave so much effort to this is because he had plans to only give her a few chapters... so he made the few chapters count...
But that also means he's adding quality to the relationship...
Of course, maybe it's also because the author isn't trying too hard to give them good chemistry...