Aki survives in the manga. The plot doesn't lead to his death. Maybe there were some tense moments that made you think that, but ultimately, he makes it through.
In a Giyuu x Shinobu fanfic, the setting and plot can vary widely. Some might be set during the main events of the Demon Slayer universe, with them facing demons together. Others could be more of an alternate universe story, where they meet under different circumstances, like in a modern - day high school AU. The fanfic could also delve into their backstories and how those experiences shape their relationship. For instance, Shinobu's past with her sister could play a role in how she opens up to Giyuu, and vice versa for Giyuu's own traumas.
I would recommend 'Whispers of the Heart' for Giyuu x Shinobu fans. This fanfic focuses on their unspoken understanding. It's full of small moments that build up their relationship, like when Shinobu leaves a small flower on Giyuu's doorstep as a sign of her care. Also, 'Shadows and Sunlight' is worth checking out. It has a great plot that involves them having to go on a secret mission together and how that journey changes their relationship from colleagues to something more intimate.
In the world of Aki Momo Thepapercranes fanfic, you can find some truly unique takes on the characters. One aspect that stands out is how different authors handle the cultural elements that might be associated with the papercranes. Some use it as a symbol of peace and hope, while others might use it to tie into a more complex cultural backstory. It's also interesting to see how the fanfic community builds on the initial charm of Aki and Momo, creating stories that can be both heartwarming and thought - provoking.