One common theme is friendship. The two Nanas have a very unique bond, and many fanfictions explore how deep that friendship can go. It could be about them supporting each other through tough times in their lives.
Rem is very loyal. Once she decides to trust and support Subaru, she is unwavering in her commitment. For instance, she will fight alongside him without hesitation in dangerous situations.
One popular 'nana x nana fanfic' story could be about their adventures in a new city together. They might discover new music and bond over it, exploring the local music scene.
Sure. One great piece of nana x nana fanfiction is 'The Unspoken Bond' which delves deep into the complex relationship between the two Nanas. It shows their mutual understanding and the unspoken support they have for each other in a really touching way.