Nishinoya doesn't die. The manga continues with him as an active and important character, contributing to the storyline in various ways without facing the fate of death.
Kageyama stays with Karasuno in the manga. His character development and contributions to the team continue without him leaving. The bond he forms with his teammates keeps him committed to the club.
Sure, Karasuno beats Shiratorizawa in the manga. The match is full of thrilling moments and showcases the growth and determination of the Karasuno team.
In a certain 'nishinoya hurt fanfiction', Nishinoya injures his knee badly. This not only affects his volleyball career but also his self - confidence. However, with the help of his coach and teammates, he gradually overcomes his insecurities and starts to rehabilitate his knee with great perseverance.
You can try fanfiction platforms like Archive of Our Own (AO3). There are often a lot of different 'nishinoya hurt fanfiction' stories there. Just search for 'nishinoya hurt' in the search bar and you'll likely find a variety of works.
One great 'Haikyuu Nishinoya x Asahi Fanfiction' is 'The Unbreakable Bond'. It really delves into their friendship and how they support each other on and off the court. The way the author portrays their interactions is so heartwarming. It shows how Nishinoya's energetic nature complements Asahi's more reserved personality.