Ukai (F/N) is the little sister of Ukai Keishin and the only grand-daughter to Ukai Ikkei. It wasn't easy living up to reputation and you had a hard enough time as it is.
After returning to Japan after living in the UK, things have changed, and it's at Karasuno's gym that you realise you want to play volleyball instead of watching like you always did. Obviously this would be hard since an accident injured your ankle badly.
You grow close to all your team members but to one boy specifically.
(Based on anime so anything there'll be different things that happen in the manga).