I would recommend 'Uta's Hidden Affection'. In this fanfiction, the development of the relationship between Uta and the reader is really interesting. It starts with small interactions that gradually build into something deeper. The description of Uta's character is very accurate to his original personality in the source material.
As of now, Uta is indeed alive. The story hasn't depicted anything otherwise. Maybe there'll be changes in the future, but for now, Uta's part in the manga continues with them being alive.
Their relationship could start with Uta being initially distrustful of Luffy. After all, Luffy is a pirate and Uta has her own ideas about pirates. But as she sees Luffy's pure heart and his determination to protect his friends and pursue his dreams, she starts to warm up to him. They might then become friends who share their different stories and experiences.
It's a visual novel mainly about the story of idol - like male characters. In this game, players can experience various plots such as the characters' growth, their pursuit of music dreams, and the relationships among them. It also features beautiful art and engaging storylines.
Since 'yuki' could be a name, and 'uta' means song in Japanese, a 'yuki uta visual novel' might be a story that follows Yuki's journey in a world where music is important. It could be a love story where Yuki uses her songs to express her feelings. Or it could be an adventure story where Yuki's music has some sort of magical or special power that helps her in her quests. There could also be various side characters with their own stories that are intertwined with Yuki's through the medium of music and the visual novel's plotlines.