Ushijima x OC x Oikawa

Being Kyōtani's sister isn't easy. Him being an overprotective brother around oikawa doesn't help with anything. Keshiki ends up getting so fed up with both of them to the extent where she decides to make the move to Shiratorizawa. With brains and being a natural at sports on her side she passes.

But what happens when stone man
Ushiwaka begins to notice Keshi-kun?