It's about a girl who loses a lot of weight and suddenly finds herself surrounded by four popular boys at school. The story follows her newfound popularity and the romantic interests that develop among them.
I'm sorry, I haven't read this light novel specifically. It could potentially be a story about Shin and Lena's relationship, and the kiss might be a significant moment in their story, perhaps representing a turning point in their relationship like the start of a romantic relationship or a moment of deepening an existing one.
A 5x7 fanfiction for 'kiss him not me' might focus on a particular moment. For example, a 5x7 photo that holds a special memory for the characters. It could be a photo of a group outing, and in the fanfiction, the details of that day are explored, how the relationships between the characters developed based on that one moment captured in the 5x7 photo.
The ending of 'Kiss Him Not Me' manga ties up most of the storylines neatly. The main character finds love and resolution in a way that's satisfying for fans.
Perhaps it's a 5x7 painting. A character in 'kiss him not me' creates a 5x7 painting that somehow represents their feelings for another character. This painting then becomes a central point in the fanfiction. Other characters might see it and misinterpret it, or the intended recipient might be deeply touched by it. This could lead to a series of events where feelings are revealed and relationships are either strengthened or put to the test.
One great fanfiction could be where Mutsumi and Shinomiya go on a trip together. They might start off as friends but gradually realize their deeper feelings. It could include sweet moments like sharing an umbrella in the rain and stealing glances at each other.